Library /sys$common/syshlp/dbg$help.hlb DEBUG, Messages, SIDEFFECT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 operators with side effects not supported (++, -)

    Facility: DEBUG, VMS Debugger

    Explanation: The user has requested the use of an operator that
    has side effects. This operation is not currently supported by
    the Debugger.

    User Action: Issue the operation and the side effects as
    individual commands