The following subsections identify issues that CICS programmers must be aware of when they develop or modify application programs that interoperate with TMA TCP for CICS as servers.

A CICS application program that processes requests originating from a remote Oracle Tuxedo domain is written like a CICS application program that is invoked with the CICS LINK command.

The CICS programs that work best for satisfying Oracle Tuxedo requests are the ones that perform a certain operation and return information to the caller. The CICS services requested by a Oracle Tuxedo client program must entail a single request/response scenario.

CICS service programs that are called from Oracle Tuxedo clients must be careful if they give up control, as when performing an EXEC CICS XCTL operation. To ensure that the response data is returned to the client, chaining programs must pass the original COMMAREA during the XCTL so that it may be RETURNed to the TMA TCP for CICS Handler by the final program in the chain.

• Programming Services with a Response
  
• Programming Services without a Response
  
• Modifying the Length of the Return Message