15.5.93 checkwindow

checkwindow( [ window ] )

[x11] Returns 1 if a mouse button has been clicked while the mouse pointer was in the specified LUX window, or (when window is not specified) in any LUX window; 0 otherwise. !ix, !iy, !xtime, !window, and !button are modified appropriately if a mouse button was clicked.

See also: !button, checkmenu, !ix, !iy, !window, xplace, xquery, !xtime, Windows