Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  ATTACH  Description
    The ATTACH command enables you to go back and forth between
    a debugging session and your command interpreter, or between
    two debugging sessions. To do so, you must first use the SPAWN
    command to create a subprocess. You can then attach to it
    whenever you want. To return to your original process with
    minimal system overhead, use another ATTACH command.

    Related command:

       SPAWN
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