This document describes how to set up a touch screen input device under XFree86. As the author had only the opportunity to work with devices from EloTouch(R) and MicroTouch(R) this HOWTO is rather specific for these devices. The examples given in this HOWTO concentrate on devices connected via the serial port i.e. /dev/ttyS0 or /dev/ttyS1. (Information about USB devices would be appreciated!)