Caps-, mode-, and alt-lock.

[ACW at MIT-AI (Allan C. Wechsler)]

   Perhaps these could be used to toggle modes in the Editor.

   One might use them to turn filling on or off, or to 
enable abbrevs, or some such.  In Lisp mode one of them might 
be used to put you into Comment Mode or something.

   Those buttons are there, after all.

   ---Wechsler