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

    (Alpha only.) The Get Previous Invocation Handle routine gets the
    previous invocation handle of any active procedure.

    A thread can obtain an invocation handle of the procedure context
    preceding that of a specified procedure context by using the
    following function format:

    Format

      LIB$GET_PREV_INVO_HANDLE   invo_handle

  Additional Information (explode) :

• Returns
• Argument