Sethioz Forum

http://en.wikipedia.org/wiki/Telnet This makes an interest for me, so i googled but found only stuff like "yeah you can" but nothing really useful. After this a make a small research in it, so how ive tried to do it:
First at all i scanned IP with some random port scanner. Telnet port is opened. After this i went into CMD and wrote down this : " telnet -o IP port ". Yay! Its seems like does something. But wtf is it? When i trying to do it 2 another IPs, sometimes i got just different text like "TCAdmin FTP Server" , "Cisco router" and so on. The main trouble i dont even know any commands to this stuff.
Anyways the main question: is it possible at all or just another idiotic idea?
Just thinking what may be its possible to execute file (keylogger for example) on another computer.

i haven't done much in telnet myself. I have only sent spoofed emails using telnet and "hacked" my router.
i have speedtouch 780WL router and web interface sucks, so i had to use telnet to put in the digiTV support for it, so it gives digiTV out of the ethernet port 4 instead of internet.

about your research, i honostly can't say much. i would google myself in this matter.

USER-Connect with username, PASS-send password, CWD change the working directory, RETR - get the file from the server
This is for FTP. I have no idea what 2 do with routers and some other things.
Also http://freeworld.thc.org/thc-hydra/ , Sethioz can you have a look at it? I have no *nix and any wordlists.
And simple example of opened ports on IP, i sure its possible to do smtng with it

this is not hydra discussion, i have tutorial about hydra HERE

i also tryied of doing it and spend a lot time with that.....then at last i gave up after failing all the time doing it.....i got every info from youtube and google and still got nothing but if people say its possible then it must b....