RACF® gives control to IRRVAF01 after each suboperand of the CSDATA keyword has been parsed according to rules for the fields from the CFDEF segment in the corresponding CFIELD profile for the field specified. Values for fields defined as hex fields will be passed to the exit as an even number of characters. For example, if the value entered was ABCD, the exit will be passed X'ABCD', and a value entered as ABC will be passed as X'0ABC'. If ABC is entered for a field defined as a character field, it will be passed as X'C1C2C3'.

The exit is given control regardless of the command's source (for example, TSO session, operator console, RACF parameter library, application program, or exit). For commands that specify the AT or ONLYAT keyword, RACF invokes the exit on each target system on which the command executes and the exit exists. If automatic direction is active, RACF invokes the exit on the local system. RACF then sends the command to the remote systems. If an IRRVAF01 exit exists on a remote system, RACF invokes that exit on the remote system.