Linked by Thom Holwerda on Tue 13th Sep 2011 23:33 UTC
Windows Today, at Microsoft's BUILD conference in Anaheim, California, Microsoft unveiled the biggest overhaul of Windows since Windows 95. The venue was not coincidental; in the same city, in 1993, during the first Professional Developers Conference, Microsoft unveiled Windows 95 for the first time. Steven Sinofsky, supported by an army of Microsoft executives, demonstrated a whole boatload of things for Windows 8, and make no mistake, they had a lot to show. Two important notes: the Windows 8 Developer Preview will be free to download later today (no activation, will be updated regularly, and includes the new interface), and Win32 is the past.
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I suggest you watch the developer videos (not the keynotes) they go into this in detail. There are three modes for a Metro app:

1) In the Foreground. In this mode the app has 100% of the CPU not being used by "classic" apps
2) 10sec after navigating away from a app, the app is suspended. That is, it no longer receives processor time at all. If you want to write a music app, you have to do the same things that you have to do in iOS. That is, tell the OS, "when I'm suspended, continue to play this stream".
3) when the system runs low on memory it will tombstone your app, you must serialize your state and then exit.

What you see with the animated tiles on the front page is actually an illusion of a running app. Updates to that screen are scheduled by the OS. So you can say, "after 10 sec, perform this operation".

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