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+aprx was originally a receive-only APRS iGate software, now extended to do
+digipeating, and Tx-iGate. It works on any UNIX-like systems with minimal
+requirements of system services, or system libraries beyond basic POSIX libc.
+
+The software is to be installed on a suitable UNIX-like system, and its
+configuration file is then to be adjusted. Then it can:
+* Handle arbitrary number of radio modems connected to itself
+* Optionally relay APRS packets from radio receivers to APRS-IS
+ (http://www.aprs-is.net) network
+* Optionally digipeat AX.25 packets with and without APRS NEWn-N
+ paradigm rules
+* Optionally relay APRS packets from APRS-IS network to radio channel
+ (Tx-iGate)
+
+This software is intended for very limited resources environment, like small
+embedded-like machines barely able to run the operating system with TCP/IP
+networking.
+A receive-only Rx-iGate does not need any sort of licenses in most parts of
+the world where radio amateur hobby is permitted to begin with.
+
+On version 2, aprx has gotten the ability to do APRS Digipeater function,
+Aprx Tx-iGate, as well as a variation of that called Viscous APRS Digipeater,
+which is an excellent choice for a Fill-In digipeater like on a mobile
+station. Viscousness means that it will listen for other copies of same
+packet for a small configurable number of seconds, and if it hears same
+packet only once, it will do normal digipeating for it.
+
+aprx can optionall be used with soundmodem in place of a hardware TNC.