How to install KeySwapper: System 7: Just drop this Control Panel file into your System Folder and restart your Macintosh! System 6: Just drop this Control Panel file into the Control Panels Folder within your System Folder and restart your Macintosh! Turning KeySwapper on/off: You can turn KeySwapper on or off at any time by clicking the on/off button in the lower left of the KeySwapper Control Panel window.