The Get Index of a Participant routine returns an index that
    is unique within the application. A value of zero signifies the
    participant that formed the application. The other participants
    in the application always return an index greater than zero.

    Format

      PPL$GET_INDEX  participant-index

1 - Arguments

 participant-index

    OpenVMS usage longword_unsigned
    type          longword (unsigned)
    access        write only
    mechanism     by reference
    The index of the caller within this application. The participant-
    index argument is the address of an unsigned longword that
    contains this index. This index is assigned at process creation
    time and is unique for each participant.