AppServer agents can connect as ABL clients to other AppServers. The following figure shows three AppServer machines (one in Windows and two UNIX) and one client application connected in an n-tier fashion.
Figure 13. AppServer-to-AppServer connections
AppServer-1 on the Windows machine accepts remote requests from the initial client application. AppServer-2 on UNIX accepts remote requests from AppServer-1, and AppServer-3 on UNIX accepts requests from AppServer-2.
Note that there is a separate AppServer session within each AppServer agent and the connection that an AppServer agent establishes with another AppServer is part of its AppServer session. That is, a connection that an AppServer agent establishes with another AppServer is part of its session context and is not shared with any other AppServer agent. For example, each AppServer agent running on AppServer-2 establishes and manages, as client, its own unique connection to AppServer-3.
