Virtual Serial Port Kit creates virtual serial ports and connects each pair of them via a virtual null-modem cable.
All the data written to one virtual serial port can be immediately read from the other one, and vice versa.
So, your applications can exchange data just like they do via hardware serial ports and real null-modem cables.
Virtual Serial Port Control is an ActiveX control which makes it possible to create virtual serial ports and control them fully.
At the same time virtual ports look like as if they were real hardware serial ports for communications applications.
VSPC + virtual serial port can as much as a serial device + a physical serial port. Moreover, VSPC drives virtual serial port the same way as a serial device drives a physical serial port.