Oracle Tuxedo Mainframe Adapter for SNA allows Application-to-Transaction Monitor Interface (ATMI) applications to communicate with the mainframe. The Oracle Tuxedo Mainframe Adapter products provides domain-compliant gateways that permit administration of the remote Transaction Processing (TP) system as a foreign domain.The ATMI application administrator enables remote domains to access a subset of Local Services. This subset is called a Local Domain. The local domain helps the administrator provide secure “views” of the application.Oracle Tuxedo Mainframe Adapter for SNA is composed of two major components that can be configured to provide SNA solutions, the Gateway and the Communications Resource Manager (CRM). These components provide a bidirectional link enabling ATMI platforms such as Oracle Tuxedo to interact with mainframe applications as either a client or server, using a CICS/ESA and IMS implicit LU6.2, or any IBM-supported Application Program-to-Program Communication (APPC) or CICS/ESA interface. Figure 1‑1 illustrates the Oracle Tuxedo Mainframe Adapter for SNA architecture.Generally, the Oracle Tuxedo Mainframe Adapter for SNA domain is like other ATMI domain gateways. It uses the DMADM and GWADM servers for administration. Within the Oracle Tuxedo Mainframe Adapter for SNA system, additional servers and processes support peer CICS/ESA and IMS connectivity and sync level 2.