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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.