Originally Posted By: Dignan
opting instead for Ctrl+F4, which is a weird choice because Alt+F4 is the shortcut for closing an entire app


Not really. Alt+ is for app-level operations; Ctrl+ is for window-level operations. Compare with Alt+Tab and Ctrl+Tab. Also Alt+Space and Ctrl+Space for MDI applications. It makes sense if you think like mid-80s IBM, which is where most of the odd key combinations (Shift+Ins, Ctrl+Ins, etc. for clipboard operations, etc.) come from.
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-- roger