ttds is a client-server version of the Tsunami Record Manager. It enables Tsunami calls to operate over any tcp network including the internet. ttds requires the professional verison of the Tsunami Record Manager to operate. The server and client are free if you wish to use it for personal, development, or freeware applications. For use in a business, commercial, or shareware application, you must pay $120 for royalty-free client distribution rights (the server itself is still free even for commercial apps). For more information, please see the Official TTDS Site