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Synergy lets you easily share a single mouse and
keyboard between multiple computers with different
operating systems without special hardware. It's
intended for users with multiple computers on
their desk since each system uses its own
monitor(s). Just move the mouse off the edge of a
screen to move to another screen; keyboard and
mouse input is then redirected to the other
screen. Synergy also lets you cut and paste
between systems and it makes screen savers
activate/deactivate in concert.