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RTL Routines, LIB$, LIB$GET_LUN
 *Conan The Librarian 

    The Get Logical Unit Number routine allocates one logical unit
    number from a processwide pool. If a unit is available, its
    number is returned to the caller. Otherwise, an error is returned
    as the function value.

    Format

      LIB$GET_LUN  logical-unit-number

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