This file contains an EDT emulation written by Peter Chang. This is not a complete emulation of DEC EDT keys. Emphasis has been made on the common keypad and cursor cluster functions. (No attempt at control keys.) No help currently available.
At the moment the problem is that there is no keysym for the Remove key (so I added a patch to handle_key.c). However keysyms for the top and right edges of the keypad are dependent on the keyboard design.