Virtual Serial Port Driver XP4 creates two pure
virtual serial ports in your system which are
virtually connected to each other. For other Windows
applications, virtual ports will be seen exactly as
two real serial ports connected via null-modem cable.
You can select any port numbers for virtual pair. For
example, you can create virtual pair COM5-COM6. In
this case all data sent by other applications to COM5
will arrive at COM6, and all data sent to COM6 will
arrive at COM5. This can be seen if you run two
HyperTerminals (or any other Windows terminal
programs) and connect one of them to COM5 and other
one to COM6. Then, all you type in first terminal will
appear at second one. Of course, you can transfer
files, other data or do whatever you want as it was
real serial ports. With Virtual Serial Port Driver XP
4.0 you can connect one application to another using
virtual serial ports pair. Applications will be able
to exchange data. This solution can be used, for
example, for GPS simulation programs.

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