PTC TeleUSE is a user interface management system and development tool used to produce graphical user interfaces based on the Motif graphical user interface (GUI) specification and the widget toolkit for building applications that follow that specification under the X Window System on UNIX and other POSIX-compliant systems. The PTC TeleUSE toolset supports the creation of large, portable, well-engineered systems and user interfaces that are easily maintained and reusable across projects.