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 performance group entered on the logon panel. You can supply a different performance group to the logon panel using this parameter. The performance group associates the TSO/E session with a set of performance characteristics. The maximum length of the performance group is 3 bytes. The data contained in this parameter is in EBCDIC form.