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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.
This service listens for incoming TELNET network connections. When a connection on the network port is received, the corresponding serial port is opened and the data between the two ports is redirected. When the network connection is closed, the serial port is closed and the service begins listening for another network connection.
Get and display the traffic counter of a Fritz!Box 7270 (or similar) in a human readable form on local host. The telnet daemon has to be enabled on the FritzBox to download the data file from the AVM router to local host.