The optional ACF2 PROFILE CLIST was implemented. Users at TSO logon get error message ACF6C004 LOGONID xxxxxxxx CHANGED every time now.
The TSO profile command permits users to update the the users TSO session attributes both in-core and in UADS so that the updates affect both current and future sessions. If the PROFILE clist is a logon clist, this will change the logonid record EVERY time a logon to TSO is done, even if the data does not need to be changed.
See ACF2 Profile CLIST for more information.