As you know about the TELNET protocol and we often start using i by just typing in command prompt and we are good to go but that’s just what happens in Windows XP. In Windows 7 if we use telnet command we will end up with a message “telent is not recognized as an internal or external command,operable command or batch file” just because by default tenet client/server are not enabled. To enable it follow these steps.
Goto start button -> Control Panel, select Program and Features
In Programs and Features windows, select Turn Windows features on or off
In the pop-up windows select Telnet Client/Telnet Server and Click Ok