How can an app hook into text selection system-wide?

I'd like to be able to track text selections across any application -- is there a hook to enable this behavior on Win32?

Bonus: Anyon开发者_如何学Goe gurus know the equivalent hooks for OS X & Linux?

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SetWindowsHookEx will do the trick.

http://msdn.microsoft.com/en-us/library/ms644990(v=vs.85).aspx