Figure 1 depicts SLU-initiated session flows 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.

1. VTAM® passes the DLU alias name, the OLU real name, the associated LU real names, and the logon mode and COS 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. VTAM passes the DLU alias name. The alias selection function has the option of returning the DLU real name, the network ID of the DLU real name, and the owning SSCP of the DLU.
4. VTAM requests translations from NETA to NETC for the OLU alias name and the logon mode name. VTAM also requests the name of the SSCP that owns the DLU.
5. This invocation is identical to number 3 except that no request is made for the owning SSCP.
6. VTAM drives the session management exit routine to translate the COS name from NETC to NETB.
7. Same description as number 6.