Is there a way to find out if the user is in the Exposé mode? (i.e., all windows are being shown.) Thank you.
How can I know if the user is in Exposé mode?
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You don't need this information. If the user is not in Exposé, F11 (or fn-F11) will enter Exposé. If the user is already in Exposé, F11 (or fn-F11) will exit Exposé. So just send F11 (or fn-F11) unconditionally.
The real challenge is determining the correct key command to send. On a laptop or small Apple Wireless Keyboard, the command may include the fn modifier, but on a desktop machine with a full-size keyboard, the command will more probably be F11 alone. Furthermore, it's user-configurable.
The correct way to toggle Exposé programmatically is a separate question.
There's no public API for getting this information. What problem are you trying to solve?