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On Windows, it's Ctrl + F2 and Ctrl + F1 which disable full screen in Citrix and send Ctrl-Alt-Del.

How do I enter these commands on a Mac?

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up vote 2 down vote accepted

Try Ctrl+Option+Delete or Ctrl+Option+Fn+Delete.

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Thanks! seems pressing CTRL + Option brings up the menu bar and the dock.. which is what I really wanted i.e. to get out of citrix. Pressing Ctrl + Option + Fn + Delete does send the windows CTRL + ALT + DEL. – user51786 Mar 9 '12 at 5:19

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