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Subcategories for Invokable TPs (CPI-C)

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The following table shows subcategories for invokable transaction programs (TPs).

Queued

or nonqueued		 Application

or service		 Starting method
Queued Running as an application or a service Autostarted or operator-started
Nonqueued Running as an application Autostarted

The concept of a TP running as a service or running as an application is distinct from a service TP or an application TP. Service TP and application TP are SNA terms that describe how a TP is used: either as a supportive service program for other Common Programming Interface for Communications (CPI-C) programs, or directly by a user, as an application. For detailed information about services in Windows, see the Windows documentation.

To write an autostarted TP so it runs under Windows as a service and also runs in a nonqueued way, write a multithreaded program with an Accept_Conversation always outstanding. For more information, see Invokable TPs.

To run an autostarted TP as an application under Windows make sure the TPSTART program is always started before the TP.