DeskMate was a software application that provied an operating environment that competed with early versions of Microsoft Windows. It originally was made for Tandy's TRS-DOS Operating System and for their TRS-80 line of computers, but eventually shifted to PC, where it was developed using C and Assembly. Like Windows (and other competitors from the time, such as GEM), it was not a full operating system, requiring MS-DOS to function. Deskmate was written by Tandy for their early PC-compatible computers, and later made available for other compatibles.