CA IDMS Server consists of both host and client components.
The host component is installed on your Central Version (CV) and performs license verification to permit access to the CV from the client components.
The client components include the ODBC driver, the JDBC driver, the JDBC server, the native SQL client interface, and, on Windows, CAICCI/PC. These components have a client relationship with CA IDMS but from an application perspective, they form part of the application server.