undo mark

I just have never had to do this before. now I have someone else using
my lisp routines.
he gets frustrated when he uses UNDO after some LISP. it undoes more
than he intended.
there is, I think, a way to set some sort of mark in the code that halts
the undo process.
isn't there?
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(command "undo" "begin")
(command "undo" "end')
place these as teh beginning and end of coding.
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