In the past each computer would need to be connected to its individual keyboard, mouse, and screen. The 2 port kvm was released to help get rid of the overload in cables and hardware and enable the user to connect 2 computers to one video screen, one mouse, and one keyboard - hence the term kvm switch. Thanks to the 2 port kvm, users found that cleaner desktops and roomier server farms helped increase production.
With the simple press of a button the user could smoothly switch control from one computer to the other. However, the first kvm switches to reach the market did have their problems. The 2 port kvm was notorious for losing mouse and keyboard control once the person switched to a different computer. A user could switch back to the original computer and find that the keyboard and mouse were unresponsive. This defect was greatly relieved as the kvm switch evolved. Today, kvm switches support the latest interfaces such as ps2 and usb and are compatible with most servers, desktops, and laptop computers. Some also support audio and ip connections. Hotplug capabilities let the user add or remove servers by simply unplugging the cables, erasing the need to shutdown the computers.