How did Windows go full screen (& F11 to exit)

While moving my mouse on the Desktop in my Win XP, suddenly the screen went
Full screen : refer to attached.

I could exit by pressing F11.

How did I get into full screen in the 1st place?  Hmm, looks like pressing F11 now
will toggle between Full & normal screens but I was sure pressing F11 previously
won't help.

What's the key combinations for Windows 7 to go & exit  Full Screen?

What's the equivalent keys for my Note 2 Android phone?
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Lee W, MVPTechnology and Business Process AdvisorCommented:
F11 is the common key for sending an application to full screen.  It's application dependent.  IE and Firefox work with F11.  It is possible that a graphics driver will also provide a hot-key combination to maximize an app or a mouse action to trigger it.

Android is a different operating system.  And since it's application dependent, it depends on the application to support that capability.

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Seth SimmonsSr. Systems AdministratorCommented:
Full screen : refer to attached.

there is nothing attached
sunhuxAuthor Commented:
Thanks, I'm now more interested in Android as
I've figured it out more or less for Windows
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Lee W, MVPTechnology and Business Process AdvisorCommented:
As I said, it's application dependent.  Are you looking for programming information?  Do you want to code this?
sunhuxAuthor Commented:
No, I'm not coding.  I'm looking at making my Note2 Android's Whatsapp
& browser to go full screen
Lee W, MVPTechnology and Business Process AdvisorCommented:
If the app doesn't have the option, you can't.  Period.
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