VMS Help RTL Routines, LIB$, LIB$ATTACH  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The Attach Terminal to Process routine requests the calling
    process's command language interpreter (CLI) to detach the
    terminal of the calling process and to reattach it to a different
    process.

    Format

      LIB$ATTACH  process-id

1 - Returns

    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

2 - Argument

 process-id

    OpenVMS usage:process_id
    type:         longword integer (unsigned)
    access:       read only
    mechanism:    by reference

    Identification of the process to which LIB$ATTACH requests the
    calling process to attach its terminal. The process-id argument
    is the address of an unsigned longword integer containing the
    process identification. The specified process must be currently
    detached (by means of a SPAWN or ATTACH command or by a call to
    LIB$SPAWN or LIB$ATTACH) and must be part of the caller's job.