TELNET (TELetype NETwork) is a network protocol used on the Internet or local area network (LAN) connections. It was developed in 1969 beginning with RFC#0015 and standardized as IETF STD 8, one of the first Internet standards. Telnet has become obsolete nowadays when we all use broadband (DSL or Wi-FI) networks. You still can find a few very good telnet services that can come in handy when you are in the area where you can’t get broadband or you are forced to use an old computer. Even if you do have full broadband capabilities, telnet can be great fun to use. Grex is one of the most popular telnet services. It can be accessed via web browser but it’s more fun to open unix shell account. When you register on grex, you can access it using telnet in Mac OS X, Linux and Windows.
In Mac OS X open terminal and type:
telenet when you hit return you will see: telnet> prompt. Type open and (to) prompt will appear. You have to enter cyberspace.org to access grex. You will also be prompted to enter username and password that you obtained by registering on http://cyberspace.org. When you log in to grex system, you will see a welcome greeting and the menu will show up (see picture above). If you are not familiar with telnet, in terminal type: man telnet or read this tutorial. Have fun using telnet 
Posted by Davor 
