With this amazing invention, you could operate two PCs from one workstation by flipping the knob from A to B and back again. Purchasing, maintaining and replacing infrequently used monitors, keyboards and mice is an unnecessary financial drain. KVM switches also give you centralized control of widespread servers.
Most switches are stackable to a certain extent.
When stacked, one switch can be plugged into a port on another switch. Vendors claim that this tiered-switch design enables you to control four to several thousand CPUs from a single keyboard, video and mouse. Obviously, you'll need to know if a switch will support the number of machines you have, and how easily it will scale if more machines are added. Add a machine, add a card. With other devices, you must decide how many ports to buy each time you expand.