The gcs634u is the IOGEAR MiniView 4-Port USB KVM Switch with Audio, a device that allows a user to control up to four computers from a single USB keyboard, mouse, and VGA monitor. It supports high-resolution video, features USB sniffing for smooth device emulation, provides shared audio for speakers, and is compatible with PCs, Macs, and Sun Solaris systems. The switch is self-powered and uses hotkeys for easy computer selection.