Virtual Serial Port Control is a powerful software developer kit (SDK) which makes it possible to create virtual serial ports and fully control them.
It is extremely useful when creating serial device emulators or when necessary to add new logic to existing legacy serial communications application.
Virtual serial ports appear in operating system as usual hardware COM ports, so serial communications applications operate with them as if they were real hardware serial ports.
From the other side, your program using developer API gets all the data written to the virtual serial port by communications application.
Then your application may respond with your own data which will be read by the communications application from the virtual serial port the same way
like it read from a physical port.