The Sync-option in EndNote is very useful: it provides a method so you can work on multiple computers and your tablet. Also you can share your library with others. First you will need to have an EndNote Online account.
Make an account:
Now you can sync your library with another computer or tablet or share your library with others. You can also access your EndNote library online.
Invite others to your library with the 'Invite others'-button in the toolbar. In the next window you can add the email addresses.
How to join a library someone has shared with you
1. Create an EndNote account and connect it to your desktop version of EndNote
2. In the Preferences menu, select Sync. Follow the instructions to log in or set up a new account
3. Once connected, select File > Open Shared Library