i just saw that it was somethig about it on some elite hackers site but they didnt explain good enough for noobs ^^
You probaly wanna use it to take over some 1's comp.
I dont wanna hear any comments like "LOL NOOB THIS IS CRACKING" "GO CRACK SOMEWHERE ELSE" "WHEN SHALL PEOPLE LEARN WHATS HACKING AND WAHTS CRACKING!!"
Anyway this guide shall not be used to do any illegal things, is you use this you have to stand on yoru own feets.
However Telnet is a very easy tool too, All you have to do is go to: start>run>telnet, then you write "O" (without "") the ip of the computer you wanna get into, and the port, 23 i standard.
if you are gonna hack a boted net (a net that is controled by a bot) i should recomand you to do this too, Fire open telnet and do as you see over this but dont send it through yet insteed first you open start>run>cmd and write ping the IP or WEB-SITE so you it gets busy with that, after doing that you use telnet fast and the bot shall not be able to take both

Then it can be so that the port 23 doesnt work ^^ then try useing the MySQL port or Apache .
And sorry for my bad English xD