If your installation is using security labels, the SECLABEL field is available on both the LOGON command and the LOGON panel. The SECLABEL set at LOGON time is valid for the length of the TSO/E session.

If you write a logon pre-prompt exit (IKJEFLD1) for your installation, you can specify a security label to be used for the session. For information about security labels and customizing the logon process, see Customizing the logon and logoff process.