EndNote allows you to synchronize the references in your EndNote library with the references in your EndNote Web library.
EndNote is the desktop version of EndNote
EndNote Web is the Web version of EndNote desktop.
The Sync process automatically synchronizes both sets of references that reside in groups so that an exact match exists in both EndNote and EndNote Web.
The Sync process is always initiated from EndNote. The data in EndNote and EndNote Web are synchronized in both applications when you run Sync. You will have identical groups and references when Sync completes processing. This includes all data changes to references (including file attachments) during the Sync process so that each library matches the other. For example, if you add or remove references and/or PDF files in EndNote, then those changes are updated in EndNote Web and vice-versa.
Sync Preferences allow you to set your preferences so that:
You do not have to enter your e-mail address and password each time you synchronize your references between EndNote and EndNote Web.
You can update your EndNote library with your EndNote Web library whenever you open or close your default EndNote library.
You can have EndNote automatically begin the Sync process every 15, 30, or 60 minutes (or manually if you prefer).
To access Sync Preference, go to the Edit menu, select Preferences... then click Sync in the list of preferences.