You can change the main() function, user exit routines, and libraries for the MCF communication service without stopping OpenTP1 when you use any of the following products that are for supporting a communication protocol:

• TP1/NET/TCP/IP
• TP1/NET/Secondary Logical Unit - TypeP2
• TP1/NET/OSAS-NIF

You can change the main() function, user exit routines, and libraries, without stopping OpenTP1, by stopping only the desired part of the MCF communication service to replace the desired files. Since this method allows the other parts of the MCF communication service to run without interruption, the OpenTP1 system can continue to operate. You can replace the following files:

• The load module (main() function) of the MCF communication service
• User-created libraries (user exit routines) used by the MCF communication service
• The library provided by the used communication protocol product

To partially change the MCF communication service, you must use the operation commands (the mcftlscom command, the mcftstart command, and the mcftstop command) for managing the MCF communication service. For details about these commands, see the manual OpenTP1 Operation.

When the OpenTP1 system uses an MCF independent restart or remote MCF service, you cannot partially change the MCF communication service.