Because of the way Oracle Tuxedo maps services to servers, service requests from remote Oracle Tuxedo regions to TMA TCP are transparent to the user, the Oracle Tuxedo developer, and the CICS programmer.

As the following figure illustrates, TMA TCP for CICS extends this transparent access by routing Oracle Tuxedo’s requests for CICS program services through TCP/IP network software.

As the following figure illustrates, TMA TCP for CICS fits between the CICS user application and TCP/IP.

When Oracle Tuxedo client programs send requests to remote systems (in this case, CICS) TMA TCP gateway transforms those requests into messages formatted appropriately for transmission to the remote system. Also, when remote systems respond, TMA TCP gateway transforms these responses into replies that local client programs can process.

The TMA TCP for CICS software is implemented as an ordinary CICS program which communicates with the Sockets Interface. It accepts connection requests from the TMA TCP gateway and returns standard replies.

Simultaneous socket connections can exist between one TMA TCP for CICS gateway (a set of TMA Handlers within a single CICS region) and all remote TMA TCP gateway Requesters. Each socket connection is established automatically when a new TMA TCP gateway Requester in the Oracle Tuxedo domain establishes communication with the TMA TCP for CICS gateway.