I wann to know the technology behind TELNET&PUTTY
can anybody helpme!!
Just so you know, starting a thread with the title "Helpme" is terribly bad! How is anyone to know what you want help with? How can someone later "search" this forum to find an answer if their question is the same as yours?
You should read the info on how to post in these forums!!!
PuTTY if just a client for telnet and SSH.
If you want to know how it work, try reading the RFCs.
Go to this page, and type "Telnet" in, click the "RFC" radio button on the right, and get any RFC dealing with telnet:
http://www.rfc-editor.org/rfcsearch.html
This page has a little more guidance, but it's links are broken - write down the numbers and read them at rfc-editor.org:
Telnet RFCs
Hope this helps.