Keyboard Maestro Wiki

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The MOUSEBUTTON() function returns whether the Mac's mouse button is pressed. It returns 1 if the button is pressed or 0 otherwise. It takes an optional parameter indicating the desired mouse button.

MOUSEBUTTON() === MOUSEBUTTON(1) === whether the left mouse button is pressed
MOUSEBUTTON(2) === whether the right mouse button is pressed
MOUSEBUTTON(3) === whether the middle mouse button is pressed

4, 5 and 6 may also be valid buttons depending on your mouse.

See Also

Documentation