Determining static and dynamic terminal signon requirements

All VTAM®-defined terminals can sign on by providing user data with the session initiation request, regardless of whether signon is required for the terminal.

You cannot sign on a user to more than one terminal simultaneously, unless you specify SGN=G, M, or Z on the startup procedure to allow multiple signons. Otherwise, IMS issues message DFS3649A or DFS2467I.

A user cannot enter signon data from an output-only device through logon or a /SIGN command. When signon data is omitted at session initiation for an output-only device that requires a signon, message DFS2085I is sent to the MTO.

Multiple signons

You cannot use the same name for dynamic LTERMs as for static LTERMs that are defined during system definition.

You can allow users to sign on concurrently to one or more terminals, static or dynamic, by specifying SGN=M in either the IMS or DCC procedures.

The IMS master terminal receives a security violation message, DFS286, for rejected signon attempts. If you do not want to receive the message, set SECCNT to 0 on the COMM macro, the IMSGEN macro, or the SECCNT initialization EXEC parameter.

Session status message—DFS3650I

When signon is achieved or if signon is not required, message DFS3650I is sent to the user indicating the status of the session with IMS.

Exception: The following terminals do not receive these messages:
  • Autologon terminals
  • SLU-1 terminals running in unattended mode
  • ISC
  • SLU P
  • 3600/Finance
In addition, if NOTERM is specified on the TERMINAL macro or on the ETO user descriptor, no DFS3650I message is received.

The information presented on the DFS3650I message panel shows whether the user is in conversation mode. This status panel also shows whether user output security exists for the terminal.