I've installed fedora on my system. and it has ssh installed by default, which runs perfectly, as per my knowledge.

now is there any way out so that I can access my machine straight from any other machine, running on windows OS.
Let's consider that, both the computers are connected via internet.
And I just want the terminal [ basically ] in the terms of access to my own computer.

I am very new to the concept of ssh in Linux.
Any comment for using telnet instead, is it secure ?

Telnet is not secure; it sends passwords in clear text. Everyone listening can get your login credentials.

To access your machine via ssh remotely, you need to open the firewall to port 22. You can do this easily with system-config-firewall. Install it with the Add/Remove Software tool, if you don't already have it.

You will also need to tell your router to forward port 22 to your machine's IP address. That means that your machine needs to be configured to use a fixed address. You can't use DHCP, unless your DHCP server (usually in the router) supports assigned addresses.

+1 for no to telnet.

This may help:

http://wiki.amahi.org/index.php/Key-...ins_With_Putty