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

    Enables you to switch control from your current process to  another
    process  in  your  job.   You can only specify one of process-name,
    /IDENTIFICATION or /PARENT.

    Format:

           ATTACH [process-name]

  Additional Information (explode) :

• process-name
• /IDENTIFICATION
• /PARENT