With a TxRPC remote procedure call (RPC), a user-created function is called. The only available RPC mode is synchronous-response-type RPC. The other RPC modes (asynchronous-response-type RPC, nonresponse-type RPC, and conversational RPCs) are unavailable.

For TxRPC communication, a function to be called is called a manager.

The OpenTP1 RPC (the function dc_rpc_call()) can also be used with any type of TxRPC communication.