Free Virtual Serial Ports
HHD Software Ltd. (HHD Software Ltd.)
Connected to a named pipe. Connected to another virtual COM port, forming a virtual "bridge" and emulating virtual Null-modem cable. Connected to two files. When an application opens a virtual COM port and "reads" data from it, data is read from an input file, and when it "writes" data to a serial port, data is written to the output file.