LEDIT : MEXPRLEDIT is a top-level command.
Call the resident Lisp editor (if there is one) inside TPS.
It takes a filename as an optional argument. In most lisps, this will probably
start up Emacs. In CMU lisp, this will start up Hemlock; use ^X^Z to leave Hemlock
again. In some lisps, this command may not work at all.
The command format for LEDIT is:
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