Eltima Serial Splitter is a program to manage ports that lets you connect two or more applications to a real serial port. You can share GPS receivers among various applications, or join various ports in just one, and all with just a few clicks.
Eltima Serial Splitter can be used to: join serial ports (real or virtual) into various ports; join various serial ports (real or virtual) into just one; redirect virtual serial port data to a real one and vice versa; organize complete series with multiple ports on both sides.
The program includes a control that lerts you when a signal is lost.