How to determine if somebody used your connection
Hi Jerome,
How to determine if somebody used your connection
First, you need to know the IP address of the computer you want to connect to.
The only sure way to  be able to connect to your PC’s is to use an ISP that provides you with a static IP address. Most ISPs give customers dynamic IP addresses, which can change every few days or even hours.
Because your IP address is the way you’ll locate your computer on the net, you’ll need to know what your IP address is you can ask you isp to help with this
Now that you know your IP address, you need to make sure that Remote Desktop Connection is enabled. Make sure your firewall is configured to allow incoming connections
Then you turn on Remote Desktop Connection in the System Control Panel you can do this by going to the start option then click on the Control Panel, System make sure to Check the Remote tab  to Allow users to connect remotely to this compute this option must be checked then You’ll have one user account that requires a password for your security reasons to log in you need to open the Remote Desktop Connection client on your remote PC.to do this to do this go  to Start, Programs, Accessories, Communications, Remote Desktop Connection. Input the IP address you want to connect to Then enter your username and password.
Then click on the connect option and your in.
good luck