Hi:

I do not know anything about Unix, and I want to learn.
Before, in my school lab, I was watching some students , who were using that program.
They always got Telnet before they accessed Unix.
How do I get Telnet and Unix on my home computer?
Thank you in advance for you answer.

Perhaps consider Linux. It is a more popular form of unix. Go to http://www.mandrakesoft.com/?wslang=en.

I am not sure why the other students are using Telnet. They may using telnet on a computer with windows OS to connect to a computer running unix. The sys ad may forbid downloading and installing alternative OS. Some school labs automatically erase anything new on all the computers every night. You can run any OS at home you can figure out how to use. I use Mandrake, but would be lost without my son in law helping.

You'll want to look into Linux.

Linux is a unix-like OS, which means it acts and feels like UNIX, but does not have any proprietary UNIX source code.

Linux comes in multiple flavors, each being geared for different audiences or uses. I use Slackware (http://www.slackware.com).

Telnet is a program that allows you to log on to another computer over a network. These days it has been mostly supplanted by ssh, the Secure SHell, because, as the name suggests, it is more secure. Telnet will send your login information in plain text, so someone sitting between you and the remote computer can intercept it. Ssh makes this much more difficult, as both your login information and the entire session itself are encrypted.

On the other hand, you may need to log into someone else's server that only uses telnet. In which case, you will need to use telnet.

If you only want to access a remote unix machine, you may just want an ssh/telnet client for ms-windows. One popular such program is PuTTY.

Have fun.