Block Or Unblock Websites without software !

Many times in schools, colleges & offices surfing some sites like orkut,etc are banned !To overcome this you can unblock these or block some other websites and play pranks !Do The Following :fFor eg you want to block www.xyz.com !* Open the folder C:WINDOWSsystem32driversetc* There you will find a file named HOSTS* Click on the file and press SHIFT and now right click on it .* From the right click menu select Open with .* Now, select Notepad to open the file from the list !* Now, in the file under the line 127.0.0.1 localhost add another line as 127.0.0.2 www.xyz.com.* Now, File>>Save !Now, open your web browser and try openning www.xyz.com , it will not load !To unblock sites just do the vice versa !