The D-Link DKVM-4U KVM switch means that you can control up to 4 PCs using only one monitor, keyboard & mouse. The monitor & the two input devices are connected directly to this KVM switch & not to the client computers. The DKVM-4U is also a cost effective solution for control of several servers in a computer room, allowing an engineer to handily manipulate all connected computers from a single monitor, keyboard & mouse.