How to virtualize a com serial port in C# refers to virtualizing a serial port that this computer doesn't have, and sending things to this virtual serial port through serial debugging tools.
You only need to install a virtual serial port driver, and you can create multiple virtual serial ports and connect two virtual serial ports. For example, if you add com3 and com4, you can open two softwares on your chart, one for sending to com3 and the other for receiving at com4.