input_cbb

    OpenVMS usage address
    type          CBB structure
    access        read only
    mechanism     by reference
    The address of the first (input) CBB structure.

 output_cbb

    OpenVMS usage address
    type          CBB structure
    access        read/write
    mechanism     by reference
    The address of the second (output) CBB structure.

 operation

    OpenVMS usage longword
    type          longword (unsigned)
    access        read only
    mechanism     by value
    The desired operation from the following list:

    CBB$C_OR    The logical sum of the two CBBs is performed and the
                result (B = A | B) is written to the output CBB.

    CBB$C_BIC   The logical product with complement of the two CBBs
                is performed and the result (B = B & ~A) is written
                to the output CBB.