The user interface has always been an integral part of DEC’s computers. From their very first computer, the PDP-1, user interaction was key to the operation of the system. It used a front switch panel plus a teletype for input/output, This was a far cry from the mostly batch interactions that were the standard previously, The PDP-1 even had a “screen” called the Type 30 Precision CRT Display. It had optional text capability and was even used for the first computer video game, SpaceWar! Also, the first word processor, called “Expensive Typerwriter” was written for the PDP-1. Jump to the PDP-11 and it’s GT-series graphics terminal systems. These were vector graphic based video systems that could be used for everything from graphic rendering to Logo Turtle Graphics. Then in 1983, DEC released the VAXstation 100 (Not to be confused with later single box units also called VAXstation), a graphics terminal that ran DEC’s first GUI called VDSS or VAX Display Subsystem Software. This usually ran on a VAX-11/725 in concert with the VAXstation 100. The next year, VWS (VMS Workstation Software) was released for MicroVMS 4.1 running on a VAXstation I. Starting with the later DECstations such the 3100s. DECwindows was released. DECwindows is an X-Windowing system just like what is being used today. DECwindows was available for VMS , ULTRIX for both the VAX and DECstation, and VAXeln. The first window manager was called DECwindows XUI or X User Interface, this was replaced by DECwindows Motif, and finally it was replaced CDE, the Common Desktop Environment which was only available for the Alpha and HP Integrity.