These PC compatible keyboards were custom built with the assistance of Sun Microsystems to work with Sun Microsystems systems. It contains Sun keys including the STOP key. Unlike other Sun compatible keyboards, this 1U keyboard will fit in a 19-inch rack and only use 1U of rackspace. While it was designed to be used in the RFT model line, it can be used as a stand-alone or incorporated into a 1U rackmount drawer featuring a convenient wrist-rest.