Open up Command Prompt* or Terminal client and type....
....and then hit Enter. Open up some popcorn and enjoy!
If you are using Vista, you'll need to enable the Telnet client first:
Start Menu>Control Panel>Programs>Turns Windows features on or off>Check 'Telnet Client'
*If you're using XP (or any older version of Windows), from the Start menu, click on Run, when the Run box opens, type in cmd and click OK.
If it's Vista, type cmd into the Search box at the bottom of the Start menu.