Library /sys$common/syshlp/helplib.hlb  —  RTL Routines, LIB$  LIB$GET_LUN, Argument
 logical-unit-number

    OpenVMS usage:longword_signed
    type:         longword integer (signed)
    access:       write only
    mechanism:    by reference

    Allocated logical unit number or -1 if none was available. The
    logical-unit-number argument is the address of a longword into
    which LIB$GET_LUN returns the value of the allocated logical
    unit. LIB$GET_LUN can allocate logical unit numbers 100 through
    119 on VAX, and 100 through 299 on Alpha and I64.
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