Null-modem emulator (com0com) - virtual serial port …
2018-6-6 · Null-modem emulator (com0com) The Null-modem emulator is an open source kernel-mode virtual serial port driver for Windows, available freely under GPL license. The Null-modem emulator allows you to create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another.