Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  Messages  CMDNOTONE
 The !AC command is not allowed in the one process debugger

    Facility: DEBUG, VMS Debugger

    Explanation: The specified command may not be used with the
    single process debugger.

    User Action: Do not use the command with the one process
    debugger.
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