"Window-win is a new design for a window system which is intended
to have all the power of the Lisp machine window system, and more
flexibility, with less complexity."
"For now, I will give commands long names for clarity.
Actually they will be represented by one- or two-character codes.
Since there are currently only 80 or so commands, one-character
codes are possible."
Here are RMS's designs for a Lisp window system called "Window-Win" from 1985, inspired by his work on the Lisp Machine window system:
http://donhopkins.com/home/archive/lisp/rms.winops.txt
"Window-win is a new design for a window system which is intended to have all the power of the Lisp machine window system, and more flexibility, with less complexity."
http://donhopkins.com/home/archive/lisp/rms.wincmd.txt
"For now, I will give commands long names for clarity. Actually they will be represented by one- or two-character codes. Since there are currently only 80 or so commands, one-character codes are possible."