Serial-only server (SRS) is a special server that can be connected to a serial port of a client. Although it is based on Fax protocol, it is virtual and the client can be PC or another SRS. The communication is synchronous, the both sides are connected and both are sending and receiving data from/to the same serial port.
Another way this could easily backfire is that it goes hand in hand with Engineered Public Confession. A savvy hero can use it as an easy way to reveal the Chessmaster or Manipulative Bastard to the world and bring their plan crumbling around them. 2b1af7f3a8