Abstract: Method, appartus and program products for persistent cache synchronization for communications over an external communication link between a client protocol conversion application executing on a first computer and a server protocol conversion application executing on a second computer located remote from the first computer are provided. Protocol conversion applications are provided on both the host side and the terminal side of the external communication link to provide communications over the external communication link using a differenced communication data stream which includes a reduced volume of data for transmittal. A checkpoint is provided to allow for improved performance on start up of a new communication session over the external communication link between the client application and the server application by initiating a checkpoint request and transmitting the request from the client to the server.

Abstract: Methods, systems and computer program products are provided which route messages from a source device on a first network to a destination device on a second network through a first routing device where the first routing device transmits a message to a master routing device. The first routing device receives a routing address from the master routing device responsive to the transmitted message. The routing address specifies an address of a device to which subsequent communications to the destination device are routed. The first routing device stores the received routing address in a list of addresses so as to associate the stored routing address with an address of the destination device of the message. The first routing device may also determine a routing address for a second message from the stored list of routing addresses based upon a destination address of the second message and transmit the second message to the determined routing address.