The CM API clients, Rational® ClearQuest® Web and CCRC, communicate with the CM Server by an implementation of the CM API.
The CCRC HTTP and CM Server Web services servlets contained within WebSphere® Application Server are the front end of the CM Server. ClearCase® RPC (CCRPC) and ClearQuest RPC (CQRPC) servers connect CM Server to the ClearCase and ClearQuest repositories.
The CM Server is implemented as one or more J2EE applications hosted in the WebSphere Application Server. Each WebSphere Application Server instance includes TeamEAR. The clients of the TeamEAR servlets (such as CQWebEAR for ClearQuest Web) might or might not be in the same WebSphere Application Server instance, depending on how you want to structure your environment. For example, you can deploy ClearQuest Web on a WebSphere Application Server instance on one machine that connects to TeamEAR on a WebSphere Application Server instance on a different machine.
The following figure shows the major components of the WAN client and server
architecture.