NAME
	IND_SETMPORT -- Set the current mouse port

   FUNCTION
	This command sets the gameport port at which the mouse is
	connected.

   IO REQUEST
	io_Message	mn_ReplyPort set if quick I/O is not possible
	io_Device	preset by the call to OpenDevice
	io_Unit		preset by the call to OpenDevice
	io_Command	IND_SETMPORT
	io_Flags	IOB_QUICK set if quick I/O is possible
	io_Length	1
	io_Data		a pointer to a byte that is either 0 or 1,
			indicating that mouse input should be obtained
			from either the left or right controller port,
			respectively.