Library /sys$common/syshlp/tracehlp.hlb ATTACH, /IDENTIFICATION  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    /IDENTIFICATION=pid

    Specifies the process identification (PID) of the process to  which
    terminal control will be switched.

    If you  specify  /IDENTIFICATION  you  cannot  specify  /PARENT  or
    process-name.