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

     ATTACH process_name
            /PARENT

     Switches control of your terminal from your current process to
     another process in your job.  Specify the target process with
     the process_name parameter.

  Additional Information (explode) :

• /PARENT