The better way to do this is give them each an inbox and outbox folder and a user account on a Unix machine. They can write to their outbox, have it be sent to

The better way to do this is give them each an inbox and outbox folder and a user account on a Unix machine. They can write to their outbox, have it be sent to the other's inbox. A watcher can watch for new messages in the inbox and trigger the other agent to read it. You can have the thread Id of the messages correspond to the session id. We don't need to reinvent things that Unix provides.