R/3 client for pooled connections.

In flow logic applications, the ITS maintains a pool of RFC connections, which are available for re-use.

Pooled connections are stateless by default, so the R/3 context is cleared after each call, but the connection is always returned to the connection pool. This reduces the connection overhead.

If no connection is available when a call is made, the ITS closes the least recently used connection and opens a new connection with the appropriate client, user, and language.