VSPD allows Windows users to create multiple virtual serial COM ports connected through a virtual null-modem cable. It's a device driver software that supports the creation of an unlimited number of virtual ports.

It's worth noting that these ports won't interact with any hardware. Instead, the data sent by other applications to COM5 will arrive at COM6, and vice versa. This means that the application listening to COM5 will get all data sent by other applications to COM6, and vice versa.
Overall, if you need to create virtual serial COM ports on your Windows system, Virtual Serial Ports Driver could be a great solution for you. It's easy to use and allows you to create as many ports as you need, all of which will be connected to each other in a virtual environment.
Version 2.0: N/A
Version 5.0:
-Full baud rate emulation (for Windows NT4/2000/XP/2003)
-Full support of HandFlow control (Hardware/(Xon/Xoff)) etc.
-Set custom signal lines wiring(custom pinout)(for Windows NT4/2000/XP/2003)
-Set/unset line connection break (for Windows NT4/2000/XP/2003)
-Automatic port creating during system boot (prior to user login)