Abstract: A KVM switch system having a touch screen for interacting with multiple computers is disclosed. The KVM switch processes coordinate data from the touch screen and transfers the processed data to the controlled computer either as absolute mouse coordinate data or as relative mouse coordinate data depending on the operating system (Windows, Mac OS, SUN, etc.) and mouse data interface (USB, PS/2, etc.) used by the computer. Thus, the touch screen can interact with all computers connected to the KVM switch, achieving a multi-platform and multi-interface application without requiring device drivers on the computers. The KVM switch stores necessary parameters for each computer so that when switching from one computer port to another, or when the display resolution of the computer changes, processing of the touch screen data is automatically adjusted accordingly. The touch screen also works within the OSD of the KVM switch.