Transcription: The communication server, the directory and security server, and the transaction server play the key role in connecting clients to servers, servers to other servers, and in connecting to existing operational systems on the AS400 and System 390, as well as coordinating resources from the network to the application. These servers reduce the cost of developing and running applications, allow for more flexibility in the network, and ensure a reliable, available application The communication server provides a gateway between networks and with IBM's AnyNet technology lets TCP, IP and SNA application ...