Poor man's telnet program
About 10 years ago I wanted to write a telnet client in PHP. My need was to login, execute some commands and logout. I was lazy to read the telnet protocol details. Hence I used the following approach to do it which worked for my purpose. Let your programming language be Java, C, C++, PHP, C# or anything else. It needs to have a TCP socket creation facility (TCP networking).
Here are the steps: