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Machine Learning Authors: Liz McMillan, William Schmarzo, Zakia Bouachraoui, Yeshim Deniz, Kevin Benedict

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Bill Gates on Cloud Computing

M: Everybody now is talking about software as a service (SaaS), cloud computing, and those sorts of things. How does the move towards those kinds of models impact desktop computing, which is clearly Microsoft's legacy, the thing Microsoft is best known for?

B: There's always been this question of "Where is computing being done, right next to you or far away?" And the more bandwidth and lower latency you have, the more flexibility you have about how you split that computer task. Time sharing had terminals where almost nothing was happening locally. Whether it was a character-based display, a 3270 or X protocol, everything but presentation was happening centrally. Then the PC swung it, before the Internet shows up, to where you're doing everything on that local device and only the file store and in some cases, the database store, are done remotely, but you have most of the business logic as well as presentation, editing, and interactions done on that device. The beauty of that is you can work offline, you get great responsiveness, you don't have to worry about the latency. Those of us who grew up with time sharing understand going back to timesharing, even with great capacity, is not that great.

Now you have more of a balance. HTML is back to the terminal model. When you browse a Web site, although HTML is way more complicated than most presentation protocols, it is a presentation protocol. Now you mix that in when you put active controls in or local script. All that AJAX stuff lets you now do some code execution. So it's ironic that the good websites are the ones that aren't using HTML, they are using local execution.

Now we are in a world where you can get the best of both worlds, when you call a subroutine, that subroutine can exist on another computer across the Internet. We now have tools for developers so they can call a service right across the Internet and they think they are calling a local subroutine.

Everything in computer science is to just write less code. What is the technique for writing less code, and its called subroutines. Everything that has ever been done—object-oriented programs, software as a service—it's about taking this idea of subroutines and being able to use them broadly. When you want to draw a map, you say "That's hard, a lot of data; I just want to call a subroutine." Well now you can call Virtual Earth or Google Earth and get back the presentation in this great form. You don't have to think about the data, the format. So we are taking subroutines to this next level and making that simple. Actually debugging the stuff, performance, making it work offline—there is still work being done on this.

In the extreme case, we can take somebody's data center and run it for them on the cloud. All the issues about administrative, capacity, who owns the data, what happens when things go wrong, when people are getting error messages, that's cloud computing and there is a lot of deep invention and work. I would say we are investing more in letting businesses use cloud computers than anyone is, and we have some brilliant projects that Ray Ozzie will be talking about more over the next year.



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