LU security includes:
Session level security, which uses the RACF resource class APPCLU to set up session keys for LUs. If two LUs try to initiate a session and the session keys do not match, SNA and RACF does not allow the session to occur.
Control of user access to LUs through the RACF class APPL.
Control of user access from an LU through the RACF class APPCPORT.
For further details, refer to the appropriate IBM documentation.
