flags

    OpenVMS usage:mask longword
    type:         longword (unsigned)
    access:       write only
    mechanism:    by 32- or 64-bit reference (Alpha and Integrity
                  servers)
    For architectures that have multiple floating-point resources
    that can be enabled separately, this longword is returned with a
    bitmask indicating which resources are enabled. On Alpha systems,
    no separate resources exist; nothing is returned. On Integrity
    server systems, the bitmask has two bits: bit 0 for the low
    floating-point bank and bit 1 for the high floating-point bank.