Sync software can create new files and changes to files are saved automatically on different computers. So you always have the latest version of all your files. Windows Live Sync is a free sync program from Microsoft.
UPDATE: Windows Live Mesh (the new name of Live Sync) is as of February 13, 2013, is no longer employed. The successor of this service that has about the same features is SkyDrive. Users of Live Mesh / Live Sync is advised to go to this service.
With Windows Live Sync (formerly known as FolderShare), you can copy files between computers to sync so you'll always have the latest copy. The free program is offered by Microsoft but is suitable not only for Windows but also for Mac computers.
It is also possible to remotely access the files on the hard drive of a computer that is running Windows Live Sync installed. This is also possible without synchronization to configure. You can use the web browser to the Live Sync website and through that website, you can remotely login to your computer and download the files you need.
With Windows Live Sync, you can also invite others to files in certain folders to be able to view and/or edit. This requires that any person other than Windows Live Sync installed on the computer.
Windows Live Sync has the following characteristics:
Windows Live Sync screenshots
You can free download Windows Live Sync and safe install the latest trial or new full version for Windows 10 (x32, 64 bit) from the official site.