Category Archives: windows

microsoft, professional, software, virtualization, windows

Storage Spaces coming to Windows 8 client as well as server

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Steven Sinofsky has posted on the Building Windows 8 blog, making it clear that this feature is coming to the Windows 8 client as well as to Windows Server 8.

I took a hands-on look at Storage Spaces back in October.

The feature lets you add and remove physical drives from a pool of storage, create virtual disks in that pool with RAID-like resiliency if you have more than one physical drive available. There is also “thin provisioning”, which lets you create a virtual disk bigger than the available space. It sounds daft at first, but makes sense if you think of it as a resource to which you add media as needed rather than paying for it all up-front. It

The server version includes data deduplication so that similar or identical files occupy less physical space. Another feature which is long overdue is the ability to allocate space to a virtual folder rather than to a drive letter.

I do not know if all these features will come to the Windows 8 client version, but as data deduplication is not mentioned in Sinofsky’s post, and the dialog he shows does not include a folder option, it may well be that these are server-only. This is the new Windows 8 dialog:

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Storage Spaces occupies a kind of middle ground in that enterprises will typically have more grown-up storage systems such as a Fibre Channel or iSCSI SAN (Storage Area Network). At the other end of the scale, individual business users do not want to bother with multiple drives at all. Nevertheless, for individuals with projects like storing large amounts of video, or small businesses looking for good value but reliable storage based on cheap SATA drives, Storage Spaces look like a great feature.

Most computer professionals will recall seeing users struggling with space issues on their laptop, not realising that the vendor (Toshiba was one example) had partitioned the drive and that they had a capacious D drive that was completely empty. It really is time that Microsoft figured out how to make storage management seamless and transparent for the user, and this seems to me a big step in that direction.

hardware, intel, software development, windows

NVIDIA plans to merge CPU and GPU – eventually

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I spoke to Dr Steve Scott, NVIDIA’s CTO for Tesla, at the end of the GPU Technology Conference which has just finished here in Beijing. In the closing session, Scott talked about the future of NVIDIA’s GPU computing chips. NVIDIA releases a new generation of graphics chips every two years:

  • 2008 Tesla
  • 2010 Fermi
  • 2012 Kepler
  • 2014 Maxwell

Yes, it is confusing that the Tesla brand, meaning cards for GPU computing, has persisted even though the Tesla family is now obsolete.

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Dr Steve Scott showing off the power efficiency of GPU computing

Scott talked a little about a topic that interests me: the convergence or integration of the GPU and the CPU. The background here is that while the GPU is fast and efficient for parallel number-crunching, it is of course still necessary to have a CPU, and there is a price to pay for the communication between the two. The GPU and the CPU each have their own memory, so data must be copied back and forth, which is an expensive operation.

One solution is for GPU and CPU to share memory, so that a single pointer is valid on both. I asked CEO Jen-Hsun Huang about this and he did not give much hope for this:

We think that today it is far better to have a wonderful CPU with its own dedicated cache and dedicated memory, and a dedicated GPU with a very fast frame buffer, very fast local memory, that combination is a pretty good model, and then we’ll work towards making the programmer’s view and the programmer’s perspective easier and easier.

Scott on the other hand was more forthcoming about future plans. Kepler, which is expected in the first half of 2012, will bring some changes to the CUDA architecture which will “broaden the applicability of GPU programming, tighten the integration of the CPU and GPU, and enhance programmability,” to quote Scott’s slides. This integration will include some limited sharing of memory between GPU and CPU, he said.

What caught my interest though was when he remarked that at some future date NVIDIA will probably build CPU functionality into the GPU. The form that might take, he said, is that the GPU will have a couple of cores that do the CPU functions. This will likely be an implementation of the ARM CPU.

Note that this is not promised for Kepler nor even for Maxwell but was thrown out as a general statement of direction.

There are a couple of further implications. One is that NVIDIA plans to reduce its dependence on Intel. ARM is a better partner, Scott told me, because its designs can be licensed by anyone. It is not surprising then that Intel’s multi-core evangelist James Reinders was dismissive when I asked him about NVIDIA’s claim that the GPU is far more power-efficient than the CPU. Reinders says that the forthcoming MIC (Many Integrated Core) processors codenamed Knights Corner are a better solution, referring to the:

… substantial advantages that the Intel MIC architecture has over GPGPU solutions that will allow it to have the power efficiency we all want for highly parallel workloads, but able to run an enormous volume of code that will never run on GPGPUs (and every algorithm that can run on GPGPUs will certainly be able to run on a MIC co-processor).

In other words, Intel foresees a future without the need for NVIDIA, at least in terms of general-purpose GPU programming, just as NVIDIA foresees a future without the need for Intel.

Incidentally, Scott told me that he left Cray for NVIDIA because of his belief in the superior power efficiency of GPUs. He also described how the Titan supercomputer operated by the Oak Ridge National Laboratory in the USA will be upgraded from its current CPU-only design to incorporate thousands of NVIDIA GPUs, with the intention of achieving twice the speed of Japan’s K computer, currently the world’s fastest.

This whole debate also has implications for Microsoft and Windows. Huang says he is looking forward to Windows on ARM, which makes sense given NVIDIA’s future plans. That said, the I get impression from Microsoft is that Windows on ARM is not intended to be the same as Windows on x86 save for the change of processor. My impression is that Windows on ARM is Microsoft’s iOS, a locked-down operating system that will be safer for users and more profitable for Microsoft as app sales are channelled through its store. That is all very well, but suggests that we will still need x86 Windows if only to retain open access to the operating system.

Another interesting question is what will happen to Microsoft Office on ARM. It may be that x86 Windows will still be required for the full features of Office.

This means we cannot assume that Windows on ARM will be an instant hit; much is uncertain.

cloud computing, microsoft, professional, windows, windows 7

Why there are no tablets running Windows Phone 7

Once again people are asking why Microsoft has not allowed OEMs to build tablets running Windows Phone 7. Matthew Baxter-Reynolds says it is to do with income from OEM licenses:

Now, Microsoft charges OEMs far less for Windows Phone licenses (about $15 per unit) than for full-on Windows licenses (on average, working out to about $56 per unit) …  But for Ballmer and the team, this is the bad news scenario. Only $15 per licence? And even less in profit? Compared to $37 in profit? It’s a money-loser, people.

While I agree that Microsoft has a problem with its business model in the new world of mobile devices, I do not follow this reasoning. There is nothing to stop Microsoft charging more for Windows Phone OS on tablets than on phones if it could get away with it. Nor is it necessarily true that Microsoft will succeed in charging as much for Windows 8 on tablets as it does for Windows 8 on PCs. In fact, that is unlikely to be be true; they will be cheaper, especially on ARM.

If it is not this then, that still leaves the question of why Microsoft has not licensed the Windows Phone 7 OS for tablets.

Microsoft has undoubtedly fumbled tablet computing and this was a costly mistake. Nevertheless, it is a company capable of strategic thinking. I think it goes something like this, in no particular order.

First, I reckon Microsoft is thinking beyond the initial OEM license income for its profits from Windows 8 tablets. It is all about the apps – 30% of the income from every app sold on the locked-down ARM edition of Windows 8. Apps tend to be cheap, and there is cost in running the store, but there is potential for ongoing income that will exceed the initial license sale. Especially if, like Apple, Microsoft insists on a cut of subscription income, in-app advertising income, and so on.

Second, Microsoft is also betting on cloud computing. Windows Phone 7 is marketed mainly as a consumer device, but Microsoft is going to play the “this is the device for professionals” card at some point. You can bet that Windows 8 tablets, and their successors, will be promoted as the ideal client for Office 365, as well as for on-premise Exchange, SharePoint and Lync. Sell a tablet, buy a customer for Office 365. Lock customers into Office 365, and sell them other cloud applications and services. Plenty of opportunity for profit.

Third, my guess is that the Windows team at Microsoft does not consider the Windows Phone 7 OS good enough to be the foundation of its future mobile platform. They respect it enough to borrow its Metro design language, along with many aspects of the development model, but in the end Sinofsky and his team were not willing to hand over the future of Windows on devices to Windows CE and Silverlight.

What we are getting with the forthcoming Windows Runtime is a more deeply thought-through new platform in which .NET, native C++ code, and HTML 5 are equally well supported, and in which developers are forced to use asynchronous APIs that keep the user interface responsive. It will be a better app platform than the current Windows Phone OS; in fact, I fully expect Windows Runtime to migrate to the phone in some future version.

If Microsoft had allowed Windows Phone 7 onto tablets, it would have the difficult task of explaining to its customers how Windows 8 tablets differ from Windows Phone OS tablets as well as from those old Windows tablets from Bill Gates days.

Therefore Microsoft took the decision to wait until Windows 8 was ready. That was a bold decision, and it may be too late, but the reasoning is plausible.

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microsoft, mobile, windows

Windows Phone, Exchange, and self-signed certificates

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I am setting up a Nokia Lumia phone, which runs Windows Phone 7.5 “Mango”. I am impressed with the smoothness of the setup experience, though I had one slight hassle which I do not blame on Nokia or Microsoft because it is is not typical.

I run an Exchange Server (and SharePoint) for test purposes with a self-signed certificate. On the iPhone and I think Android, you just get a warning the first time you connect and after that it all works. Windows Phone though gives you a certificate error when Outlook tries to connect and will not let you proceed further.

Which of these approaches is right is a moot point: convenience versus security I guess.

Fortunately it is not too hard to get Windows Phone to trust your certificates. Here is what I did:

1. Email the certificate(s) to myself on Google Mail.

2. Go to Google Mail in the phone’s browser. For this to work I found I had to use the Basic HTML view, as the mobile view did not let me download the attachments.

3. Open the email you sent to yourself. Tap the attachment. Windows Phone offers to install the certificate, tap to install.

4. Now go back to Outlook and synchronise, everything works.

You will also need this for SharePoint if you want to use Office on the device.

Of course if your Exchange and SharePoint use a certificate from a trusted certificate provider then these steps are not necessary.

apple, development, internet, microsoft, professional, Web, web authoring, windows

HTML5 scorecard: Amazon Kindle Fire weak, iOS 5 great, IE10 preview one of the best

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The Sencha blog has a great series of posts on HTML5 support on various devices. This is of direct interest to Sencha because its products are JavaScript and CSS application frameworks, Sencha Touch for mobile and ExtJS for any browser. The latest post is on the Amazon Kindle Fire – and it is weak:

The Amazon Kindle Fire doesn’t seem designed to run HTML5 apps as a primary goal. It does a good job of displaying ordinary web pages and its resolution and rendering capabilities meet that need well. But there are too many sharp edges, performance issues, and missing HTML5 features for us to recommend that any developer create web apps primarily for the Kindle Fire. The iPad 2 running iOS 5 continues to be the tablet to beat, with the PlayBook a respectable runner-up in HTML5 capabilities.

Part of the problem is that the Fire runs Android 2.3.4 (Gingerbread) which has a weaker browser than later versions. That is not the only source of disappointment though. According to Sencha’s Michael Mullany, the GPU is not used for hardware acceleration of browser content, the JavaScript timer is laggy, there is no embedded HTML5 video (videos launch in a separate player), and CSS corners are not properly anti-aliased.

But what about the Kindle’s cloud-accelerated browsing that we heard so much about when it was announced? This is the biggest disappointment:

One of the main selling points of the Kindle browser is supposed to be its cloud-caching and pipelined HTTP connection that uses the SPDY protocol. This does seem to speed up normal page browsing a little, but it’s not very noticeable and we didn’t test this rigorously. But for HTML5 web apps, where code is downloaded and executed, there doesn’t seem to be any performance difference when we tested with acceleration on and off. It doesn’t appear as if client JavaScript is executed on the server-side at all, so the Kindle does not seem to have Opera Mini-style server-side execution. And SunSpider scores were essentially the same when accelerated browsing was turned on or off.

Moving on from Kindle, it is interesting but not surprising to see a great report for HTML5 in Apple’s iOS 5. Less expected though is a big thumbs-up for HTML5 in Microsoft’s IE10 preview on Windows 8:

Simply put, (and with the caveat that we were running on the notably overpowered developer preview hardware) the IE10 HTML5 experience is one of the best we’ve seen on any platform to date. After a decade of web neglect, Microsoft is back with a vengeance.

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The main caveat is the absence of WebGL. Microsoft is supporting its own 3D graphics library.

Another worry for Microsoft is simply the level of hostility towards the company and IE in particular, among the developer and designer community it so much wants to reach. You can get a flavour of this from some of the comments to Mullany’s post, for example:

I never really like Windows and I absolutely despise Internet Explorer. There are so many exceptions in code to be made for Internet Explorer that i stopped trying so hard to make it look the same as other browsers. Hopefully, IE 10 will stop all of these exceptions and weird additions that are made to websites that make everything instantly awful so I can actually go back to trying to make things look nice in IE. It’s really sad though that so many people use Windows and IE that we cannot ditch it for a better system and better browser.

What about Android? The most recent offering covered in the Sencha series is Motorola Xoom which is a disaster:

We were excited about the first true Android operating system for tablets and had high hopes for a mobile browser that was as powerful as the platform. Sadly, the Xoom and Honeycomb are a real disappointment. We found consistent and reproducible issues in CSS3 Animations and CSS3 Transitions among other things. We had issues where the browser either hung or crashed. Regular scrolling was slow or below full framerate. We had issues where media playback failed or performed incorrectly. At times it felt like we were using a preproduction device, but we bought our test device from a Verizon Wireless store.

I have a hunch that the latest Galaxy Tab might fare better. Sencha did like the HTML5 support in the BlackBerry PlayBook though.

With Adobe Flash now in decline on mobile devices (Adobe is no longer working on the mobile Flash player) HTML5 support is all-important for rich browser-hosted apps; I will be watching with interest for future Sencha reports.

.net, apple, development, microsoft, mobile, professional, software development, visual studio, windows

Quick thoughts on Xcode and Objective C versus Microsoft’s tools

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I have been trying out JetBrains’ AppCode which meant working in an Apple development environment for a time. I took the opportunity to implement my simple calculator app in iOS native code.

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Objective C is a distinctive language with a mixed reputation, but I enjoy coding with it. I used Automatic Reference Counting (ARC), a feature introduced in Xcode 4.2 and OSX 10.7, iOS 5; ARC now also works with 10.6 and iOS 4. This means objects are automatically disposed, and I did not have to worry about memory management at all in my simple app. This is not a complete memory management solution (if there is such a thing) – if you use malloc you must use free – but it meant that the code in my app is not particularly verbose or complex compared to other languages. Apple’s libraries seem to favour plain English method names like StringByAppendingString which makes for readable code.

I was impressed by how easy it is to make an app that looks good, because the controls are beautifully designed. I understand the attraction of developing solely for Apple’s platform.

I also love the integrated source control in Xcode. You find yourself using a local Git repository almost without thinking about it. Microsoft could learn from that; no need for Team Foundation Server for a solo developer.

I did miss namespaces. In Objective C, if you want to remove the risk of name collision with a library, you have to use your own class prefix (and hope that nobody else picked the same one).

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Interface Builder, the visual UI designer, is great but many developers do not use it, because coding the UI without it is more flexible. It is a shame that you have to make this choice, unlike IDE’s with “two way tools” that let you edit in code or visually and seamlessly keep the two in synch. I found myself constantly having to re-display windows like the Attributes Inspector though it is not too bad once you learn the keyboard shortcuts. The latest Interface Builder has a storyboard feature which lets you define several screens and link them. It looks useful, though when I played with this I found it difficult to follow all the linking lines the designer drew for me.

It is interesting to compare the Mac and iOS development platform with that for Windows. Microsoft promotes the idea of language choice, though most professional development is either C# or C++, whereas on Apple’s platform it is Objective C and Cocoa or you are on your own. Although Mac and Windows are of a similar age, Microsoft’s platform gives a GUI developer more choices: Win32, MFC, WTL, Windows Forms, Windows Presentation Foundation and Silverlight, and in Windows 8 the new WinRT.

I get the impression that Microsoft is envious of this single-minded approach and trying to bring it to Metro-style Windows 8, where you still have a choice of languages but really only one GUI framework.

That said, Visual Studio is an impressive tool and both C# and C++ have important features which are lacking in Objective C. I would judge that Visual Studio is the more productive tool overall, but Apple’s developer platform has its own attractions.

microsoft, windows

Moving Windows with its applications: too difficult

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I have just replaced my PC – well, if you count new motherboard, new CPU, new hard drive, new RAM as replacement, though it sits in the same case – and faced again the question of what to do with my Windows setup, complete with hundreds of applications.

A few years back, there was no question. You took every opportunity to do a clean install, because without it Windows gradually became unusable, as gloriously recounted by Verity Stob.

Stob’s analysis is not completely wrong today, but the matter has greatly improved. The Windows 7 64-bit installation that I use today was installed in August 2009 (run systeminfo if you want to check yours), and that was an in-place upgrade from Windows Vista 64-bit, as recorded here. That Vista install was done in January 2008, so I have preserved applications and settings for coming up to four years and two motherboard changes.

The trade-off is that in return for putting up with some cruft you get a big win in convenience. There is no need to dig out install media, downloads and licence codes, and migration to a new system is quicker.

So why complain? Well, although it can usually be done, moving Windows from one machine to another is not supported by Microsoft, unless the hardware is identical:

Microsoft does not support restoring a system state backup from one computer to a second computer of a different make, model, or hardware configuration. Microsoft will only provide commercially reasonable efforts to support this process. Even if the source and destination computers seem to be identical makes and models, there may be driver, hardware, or firmware differences between the source and destination computers.

What this means is that users who get a new computer are directed instead towards the Windows Easy Transfer application:

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This is a handy tool, but it does not transfer applications. This last point can be particularly tiresome if you use software that requires activation on each machine on which it is installed, not least Microsoft’s own Windows and Office. Adobe’s Creative Suite, for example, allows installation on up to two machines, after which it will no longer install unless you specifically deactivate it:

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If you trash your old PC, or it breaks, without deactivating first, then you have to call support and plead your case.

Apple’s Migration Assistant, by contrast, does move applications, making a better user experience.

If you can easily move applications, settings and data, of course, there is no need to move the entire operating system, since you have all that matters.

Why does Microsoft make this so hard? Two reasons I can think of.

One is that there are technical challenges in moving Windows to new hardware; though having said that, I suspect that Microsoft could easily have created a migration wizard that includes applications if it wished to do so.

The second, and more important, is licencing. Most consumer versions of Windows (and Office too) are OEM licences, which are not allowed to be transferred from the machine with which they are supplied. If Microsoft made it easier to move Windows or to migrate applications, less new software would be sold. Enterprises are expected to handle this in a different way, with centralised application management tools.

Virtualisation changes the game of course. The point of virtualisation is that you run the operating system on abstracted hardware that can easily be replicated on another machine. I really would like to run a virtual desktop, but I do not have a suitably high-powered server and there are niggles over fast graphics, USB devices, studio quality audio and so on. I expect all these to be solved and that a virtual desktop is in my future.

In the meantime, I have personally lost patience with the idea of reinstalling everything, and fortunately I do not use OEM Windows licences.

The wider question is interesting though. Although the desire of Microsoft and its partners to protect licence income is understandable, there are new models of application licencing that work better for users. In Google’s world you just sign on in your browser, and all your stuff is there. In Apple’s world, your iOS apps are licenced to you, not your device, and when you get a new device they all reappear. Even Microsoft’s Xbox works like this too, though that was not always the case.

This competition, in combination with virtualisation, means that Microsoft’s approach with Windows looks out of date as well as being unpleasant for users.

Windows 8 is on the horizon, and I would guess that the forthcoming Windows Store will be better in this respect, though note that at its Build conference in September Microsoft did not discuss the business aspects of the Store.

facebook, microsoft, mobile, nokia, windows

Nokia’s Windows Phone gamble

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At Nokia World in London on Wednesday, CEO Stephen Elop presented the new Lumia range of Windows Phones. You can watch the keynote here – I was impressed by Elop’s clarity and conviction, and also by VP Blanca Juti who talked about the Asha range of nearly-smartphone feature phones.

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The demonstration of the Windows Phone OS and apps seemed to me weaker and you could sense a struggle in energising the audience. I suspect this is because Windows Phone has already been out for a year and has failed to meet expectations; clearly it takes more than live tiles to make a success of a new Smartphone.

Elop is aware of this which is why he made the following widely quoted remark:

[Lumia is] the first ever instantiation of the windows phone platform that properly embodies, complements and amplifies the design sensibilities of windows phone … more simply stated, Lumia is the first real Windows Phone.

I have yet to handle a Lumia but I believe Elop, in that the other Windows Phone 7 devices are no more than ordinary in their design, whereas Nokia has done something distinctive.

I was impressed by the demo of turn by turn navigation; this does look like an attractive and useful app.

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I was also impressed when Elop talked about the marketing effort which Nokia and its retail partners are putting behind Lumia. He said that there are 31 operators and retailers in size countries which:

…have each committed to significant levels of marketing investment which includes unprecedented retail exposure and three times the level of total marketing investment compared to any other single Nokia launch.

He added that Nokia will be distributing seed devices widely among retailers so that they really know (and, Elop claims, love) the Lumia Windows Phones.

My immediate reflection is that Microsoft needed Nokia a year ago; Windows Phone has never before received this kind of backing. I am not sure that I have ever seen a Windows Phone for sale in my local small town centre, which has several mobile phone shops.

The tough question: is the OS good enough to compete with Apple and Android? I think it is a reasonable alternative, though I personally find the 20 beautifully designed icons I see on the first screen of the iPhone 4 more appealing than the seven chunky, flickering tiles I see on a Windows Phone. That said, I can see that the Windows Phone makes a good Facebook phone. I also like the Office apps and their read-write support for SharePoint, which is useful to me as a SharePoint user.

Where Windows Phone falls short is in the quality and availability of apps. There may be 30,000 in the Marketplace, but most of them are rubbish, and if you have a niche interest it is less likely to be represented than on an iPhone. I play Bridge, and on the iPhone I can enjoy FunBridge among others; on Windows Phone, nothing yet.

I have also found the data in Local Scout, a location-based index of places to see, shop or eat, too poor to be of much use where I am, though it may be better in London or other big cities.

If Nokia can win significant market share through its new range, problems like these will solve themselves as more people will care about them, and more apps will be developed.

It does need early success though, and this will not be easy bearing in mind that the general public are not really discontented with what is already on offer from others.

Nokia seems to have the right marketing ideas though, and the prices look reasonable. Watch this space.

microsoft, professional, windows

Blue screen, Windows 8 style

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This is what happens when Windows 8 crashes:

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The restart message proved false, and I had to reset the virtual machine.

I did the search, which told me:

The CLOCK_WATCHDOG_TIMEOUT bug check has a value of 0x00000101. This indicates that an expected clock interrupt on a secondary processor, in a multi-processor system, was not received within the allocated interval.

This proves that you make give blue screens a prettier face, but that does not make the error messages any more helpful to a non-expert user. Or should I head for my nearest computer store and ask if they have a spare clock interrupt?

microsoft, mobile, windows

Microsoft financials: Server and Office business still growing

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Microsoft has announced its quarterly figures for July-September 2011. Despite its problems in mobile and in search, and the declaration of a post-PC era by competitors, the company is still a huge money-making machine. Here is my at-a-glance summary of the segment breakdown:

Quarter ending September 30th 2011 vs quarter ending September 30th 2010, $millions

Segment Revenue Change Profit Change
Client (Windows + Live) 4868 +83 3251 -335
Server and Tools 4250 +386 1597 +57
Online 625 +98 -494 +64
Business (Office) 5622 +401 3661 +196
Entertainment and devices 1963 +168 352 -34

These look like decent figures to me, though Microsoft’s broad-brush breakdown disguises trouble spots like the poor sales of Windows Phone 7. The online business, which includes Bing and ad sales, continues to bleed money, though slightly less than for the same quarter last year.

Microsoft says Bing-powered US search share (which includes Yahoo!) is now 27%, which is impressive, though I look at stats for itwriting.com and see Bing and Yahoo! at 4.7% combined, even though it has more visits from the USA than from any other region. Bing must have some area of strength that does not include technology blogs.

Currently the stars of the show are Server and tools, where Microsoft reports a sixth consecutive quarter of double-digit growth, and the Business division, where Microsoft reports strong growth for SharePoint, Lync and Exchange.

Microsoft also says that Office 365 has “strong adoption from small businesses to large enterprises”, though there are no exact figures. It does not surprise me me as it is an excellent product, misreported by some media who exaggerated the importance of Office Web Apps. Forget Office Web Apps: this is hosted Exchange and SharePoint, with web conferencing thrown in.

Entertainment and devices is mainly Xbox. My observation here is first, to note how well Microsoft has done to take Xbox to the top spot in the US console market, overtaking both the previous generation champion Sony and the once-unstoppable Nintendo Wii; and second, to note how small the profits are relative to the rest of the business. This may be slightly unfair, as I imagine some of those Xbox profits have been poured into Windows Phone investment.

Finally, I was amused by the Metro-style design of the accompanying PowerPoint slides:

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