Interrupt question

[narain@rand-unix]

Hi, I would be grateful if you could tell me  what  is  the  equivalent  of
Interlisp's  control-h  (followed  by  OK) in Franzlisp.  In other words, I
wish to interrupt a Franzlisp program, from time to time, examine its state
and allow it to continue from the interrupted point.

-- Sanjai