You can infra-red or radio. With either you get a "dongle" containing a Rx/Tx which plugs into the PC and talks to the mouse/keyboard.
radio is better than IR as it does not have to be line of sight and be tucked down out of sight behind the PC.
Regardless of your present type you can (if you have a motherboard with on-board USB) get a USB mouse/keyboard.
ps.Single round plug is a PS2, probably plugs straight into a port beside an identical one that is for the mouse.
[ 26 January 2002: Message edited by: ORAC ]</p>