EXIT

        [SIC\]EXIT

    EXIT  always  ends SIC execution, at any level. In interactive sessions,
    <^D> has the same behaviour as EXIT.

    On the opposite <^Z> only ends the current level of execution,  so  that
    when  typed at the top level, <^Z> also ends the session. Note that <^Z>
    may be trapped when interactive editing is enabled.

    Note that end of SIC execution does not necessarily means end of program
    execution: SIC may be entered again later by the calling program.