It's basically the same as Microsoft's Remote Desktop program. Windows XP comes with a Remote Desktop client, and if you were to connect to another computer miles away, you would be able to see that computer's desktop on your computer screen and make changes to it with your mouse. The person sitting at the workstation of the remote computer can actually see every mouse action or command you make.
Now if all you want to do is create a file server, then an FTP server would be the better choice.
Now if all you want to do is create a file server, then an FTP server would be the better choice.