If you need to control a number of different computers but would rather only use one keyboard and mouse. The new ShareMouse software which has recently be launched might be worth more investigation.
Rather than using hardware and cables to connect all the computers together to your single keyboard and mouse. ShareMouse is software which is installed on to each computers stem you would like to control and can be used with upto 26 computers simultaneously. Watch the video after the jump to see ShareMouse in action.