Logon pre-prompt exit IKJEFLD/IKJEFLD1

The logon pre-prompt exit IKJEFLD or IKJEFLD1 receives control:

After the logon processor receives a LOGON command from the TSO/E user
Before the logon processor accesses the UADS data set or the RACF® data base to verify logon information
Before the logon processor displays the full-screen logon panel for the first time. (If your installation does not use full-screen processing, the exit receives control before the user is prompted for information.)

Using exit IKJEFLD, you can verify, change, or supply various logon operands, or cancel a logon. You can use the authorized logon exit, IKJEFLD1, to perform the same functions as IKJEFLD, and additional authorized functions. For more information about the logon exits, see Writing a logon pre-prompt exit (IKJEFLD/IKJEFLD1).