OpenTP1 can be used in LANs in which distributed applications are constructed using the client/server model. In such a system a server application can be coded so that it can provide a service to clients located on other workstations. Client application code contains special OpenTP1 functions that indicate the start and end of a transaction, and OpenTP1 manages such a transaction even if parts of the transaction are processed on different machines in the system.

When such a system needs to be expanded to handle increased work loads, the required hardware can be added while continuing to use the online transaction processing system and without complicated reorganizations of software resources. In this way you can flexibly construct systems that are appropriate for the required work situation.

Such LAN systems also enable collaboration between servers, and enable full use of advanced GUI applications.

Figure 1-6 illustrates an OpenTP1 online transaction processing system in a LAN. Note that the diagram contains the word node. In this manual, a node is a computer (machine) on which OpenTP1 operates and which is connected to a network.

Figure 1-6 OpenTP1 online transaction processing using the client/server model in a LAN