Another Key Command question: Alt-F4

On my Mac Pro Alt-F4 serves to quit PC applications and also to Turn Off Computer

On my MacBook it launches Spaces!

Can anyone suggest:

how to implement Alt-F4 so it quits applications

how to disable Alt-F4 from launching Exposé and Spaces prefs - even though I have spaces disabled?
Alt-F4 is not listed in OSX keyboard&mouse shortcuts AFAICT

peter
 
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