Small Client Model

If you use the small client model, your ESQL application is separated into two distinct executables that communicate through Progress local interprocess communications (IPC) or network communications (NC) modules as shown in Figure 1–2. These two executables are:

Figure 1–2: Small Client Model

The Open Interface Architecture and the Small Client Model

Progress supports the ESQL small client model as part of its Open Interface Architecture. This architecture enables non-Progress applications to access Progress using several standard data interfaces, including SQL. During execution, an Open Interface Broker actually starts and assigns an OID for each ESQL small client application that accesses Progress.


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