The Express® Logon Feature (ELF) allows a user to connect to an MVS™ host VTAM® application without explicitly entering a user ID or password. Telnet uses the client certificate to resolve the user ID and RACF® generates a temporary password, a PassTicket. ELF requires a secure connection with level 2 client authentication, a client that supports ELF, and RACF PassTicket setup.
The ELF function is activated by specifying the EXPRESSLOGON parameter. The function can be deactivated by specifying NOEXPRESSLOGON. Either parameter can be coded in TELNETGLOBALS, TELNETPARMS, or PARMSGROUP. For a detailed discussion of ELF, see Express Logon Feature.