proc_name

    OpenVMS usage character_string
    type          character string
    access        read only
    mechanism     by reference
    Address of the process name string (zero-terminated).

 proc_index

    OpenVMS usage longword_unsigned
    type          longword (unsigned)
    access        read only
    mechanism     by value
    The index of the desired process.

 proc_addr

    OpenVMS usage address
    type          longword (unsigned)
    access        read only
    mechanism     by value
    The address of the PCB for the desired process.