Is there a way to STOP the key from being sent to the active window then? I understand what you are saying, to stop certain keys from being sent to the other windows(do-not-pass), or allowing only certain keys to be sent(white-list). I have two characters with two wows

Character A is active, Character B is minimized.

When I press F4 I want character A to stay put but character B to move forward.

Then I alt-tab

Character B is active, Character A is minimized.

When I press F4 I want character B to stay put but character A to move forward.

Does that make a bit more sense?

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Would it be possible to do this in Autohotkey? I could use Autohotkey for formations, and keyclone for everything else.