rab

    OpenVMS usage:rab
    type:         longword (unsigned)
    access:       modify
    mechanism:    by reference
    Data structure used to set up a read-with-prompt OpenVMS RMS
    operation. Normally you pass the RAB address in LGI$A_ICR_INPUT_
    RAB.

 flags

    OpenVMS usage:mask_longword
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference
    A data structure that determines the error response as follows:

    Flags
    ValueResponse

    0    Normal error message.
    1    LOGINOUT exits quietly.
    2    Normal error message; however, the callback routine returns
         control to the caller rather than exiting on timeout
         (timeout status is in RAB).