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Re: Clearing the screen and other such things.

Doesn't UNIX (4.0, 4.1, 4.2 BSD) and those derived from it (e.g. Xenix)
have a cursor-control package, and aren't there editors (e.g. vi, gnumacs,
Gosling emacs) that use the termcap (or similar) information files?
I believe that Franz Lisp provides a set of primitives to do all this 
character-screen oriented stuff (to the extent it is supported by Unix).