The RACF® group ID is used only if RACF is installed. Upon initial invocation of IKJEFLN1, this parameter contains either the value from the previous TSO/E session or the value specified on the LOGON command. Upon subsequent entry to IKJEFLN1, this parameter contains the RACF group ID entered on the logon panel. If your installation uses RACF, you can use this parameter to supply a different RACF group ID to the logon panel. The RACF group ID identifies the security group associated with this TSO/E session. The maximum length of the RACF group ID is 8 bytes.