7/183.2.4 KMS (1983)
KMS (Knowledge Management System) was developed at Carnegie Mellon University and has been a commercial product since 1983. It runs on UNIX workstations. The interesting thing about KMS is the simple data structure, which provides for just one type of node, a frame. A frame can cover the whole screen or the screen can be split into two frames. Contrary to window-based systems, one cannot change the size of a frame or scroll the text in it. There was also a special ``home'' frame, which was directly accessible from any other frame, and backtracking to the previous frame was also possible.