If someone has trouble logging to net, you can help him from home. You can setup his modem correctly from your home.
 
Note: This will work if you both have the same modem.
			
			- Ask him or her to find the I.P address. (Can be found by type 192.168.1.1)
 - Ask the modem password.
 - Also ask them to keep their modem on.
 - Connect to the internet at your home and type the I.P address.
 - You will see asking for password and username type it. Modem site opens then do want you wont from your home.
 
Note: This will work if you both have the same modem.