GpsGate can be used as a virtual null modem. If you have two applications you want to connect to each other using serial ports you need a null modem. A null modem is bascially a cable to connect two serial ports to each other. Normally you need two computers or two physical ports on one computer to achive this. Using GpsGate you can emulate the null modem and run the two applications on the same computer without any additional hardware.

Steps to set up GpsGate as a null modem:
1. Open the settings menu.
2. Select "Virtual port" as Input.
3. Select a port and click "Open" (e.g. COM4).
4. In the Output dropdown, select "Virtual ports".
5. Select a port and click "Add virtual port" (e.g. COM7)
6. Close the settings menu and you are finished!

COM4 and COM7 (or whatever ports you selected) are now connected to each other as a null modem.