1)   Virtual Serial Port Driver XP4 4.0
Using Virtual Serial Port Driver XP4 you can create virtual serial COM port pairs which are virtually connected to each other via virtual null-modem cable and for other Windows applications seen as real serial ports connected via null-modem cable.
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 2)   Shared Serial Ports 1.1
Shared Serial Port allows you to share real serial ports between multiple applications. All applications will be able to receive data from real serial port simultaneously, as well as send data to it.
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