FJJP,
The switch Richard is refering to is a Keyboard/Video/Mouse switch or KVM. They come in a variety of styles but generally switch 1 video and 2 ps/2 connections. Ideal for what you want I would imagine. You can use wireless systems with them...Just plug the transmitter in place of the "normal" KB/Mouse. You can use USB mice as well but need to use the USB>PS2 adaptor.
I have a 4 port which has both manual pushbutton switching and keyboard operated switching. Generally the KB switch uses the scroll lock key as the switching key. It is MUCH better using my 20" monitor/ full KB and wireless mouse than the 12.1" screen mini KB and worthless pointing device that is on my laptop!