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The Null-modem emulator (com0com) is a kernel-mode virtual serial port driver for Windows. You can create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another. The HUB for communications (hub4com) allows to receive data and signals from one COM or TCP port, modify and send it to a number of other COM or TCP ports and vice versa.
Debugging tools for application-to-application communication.
GateDebugger may be performed free communication using COM port, TCP / IP, UDP and the like.
Further, it can be blocked or free communication data and filter.
Ponticulus (a virtual COM-port over TCP/IP redirector) allows synchronous connecting and disconnecting to a remote serial port (e.g. on an embedded device). It was initially based on com2tcp, part of the com0com project. (http://com0com.sourceforge.net/)
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tcp2com creates a bridge between a TCP socket and a serial port (COM). The program runs as a service under Windows NT. With tcp2com, you can telnet into any device you may have plugged into your COM port.