The OpenTP1 operating environment and the resources used by OpenTP1 are specified in system definitions. The OpenTP1 system definitions are categorized as follows:

• System service definitions
  Defines items relating to the basic facilities of OpenTP1 (TP1/Server Base), file services, the multi-node facility, and the message queuing facility.
  
• Network communication definitions
  Required when using the message exchange facility (TP1/Message Control).
  
• Message queue definitions
  Required when using the message queuing facility (TP1/Message Queue).
  

To create these definitions, prepare a file using a text editor. For details about the system definitions, see the manual OpenTP1 System Definition.

Figure1-12 shows how the OpenTP1 system definitions are organized.

Figure 1-12 Organization of OpenTP1 system definitions