<graphcon>.grab-setup ["button"] ["modifier"]
The grab button button specifies which mouse button that is used to grab and ungrab input for the console. A keyboard modifier modifier should also be specified that must be pressed for grabbing to occur. Valid buttons are left, middle and right, while valid modifiers are alt, control and shift. Only the left side modifier are currently used. When called with no arguments, the currently selected button and modifier will be printed.
graphcon