<Help>

[Kent M. Pitman <kmp at MIT-MC>]

In System 79.52, ... 

* <Help> prompts "Doc A,C,D,L,V,W,<Space>,?: ", but does not mention "U" which
  is an allowable option at that point. The help text you get when you type "?"
  mentions "U", however.

* Typing <Help> to the aforementioned prompt just beeps. It seems like this 
  should do the same as "?" ... <Help> should do useful things as often as 
  possible. Indeed, given the existence of a <Help> key, people shouldn't be 
  encouraged to think that "?" is the right thing to type for help.