Figure 1 depicts SLU-initiated session flows (with USERVAR name) for the alias selection function; it indicates when the alias selection function is invoked and for what reason. The numbers correspond to the descriptions after the figure.

APPLA initiates a session with an application program named UVNAME. SSCPC recognizes that UVNAME is a USERVAR for the application program named APPLC.

1. VTAM® passes the DLU alias name, the OLU real name, the logon mode name, the COS name, and associated LU names as known in the OLU's network. The alias selection function has the option of returning the DLU real name, the network ID of the DLU real name, the owning SSCP of the DLU, the OLU and associated LU alias names as known in the DLU network, and the logon mode and COS names as known in the DLU network.
2. Same description as number 1.
3. SSCPC recognizes that UVNAME is a USERVAR for APPLC, returns the real name on the DSRLST RSP, and drives the session management exit routine to translate the DLU real name to the DLU alias name.
4. VTAM drives the exit routine to translate the DLU real name to the DLU alias name.
5. Same description as number 4.
6. SSCPA restarts the session with the new application program name and drives the session management exit routine to translate the OLU alias name, associated LU alias names, the logon mode name, and the COS name from NETA to NETC.
7. VTAM drives the exit routine to translate the OLU alias name, the associated LU alias names, the logon mode name, and the COS name from NETA to NETC.
8. Same description as number 7.
9. VTAM drives the exit routine to translate the COS name from NETC to NETB.
10. Same description as number 9.