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sercd is an RFC 2217-compliant serial port redirector. It lets you share a serial port through a network. It is based on sredird. The RFC2217 protocol is an extension to telnet and allows changing communication port parameters.
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.
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