Daylite 3.5 now shares information with Address Book, iCal, other applications, and your phone or handheld device using a Mac OS X technology called Sync Services.
It runs in the background on your computer to ensure that data in all these places is synchronized and up to date.
You can't interact with Sync Services directly—it acts as a central database of information to be shared with any software that supports synchronization.
If Daylite's synchronization is turned on, it will automatically sync contacts, organizations, tasks, and appointments with other applications or devices using Sync Services. You can specify which data is passed on to Sync Services and thus synchronized to Address Book, iCal, and your mobile device.

Note: Daylite will only synchronize when it's open. If you make changes on your phone, in Address Book, or in iCal, the changes will synchronize the next time you open Daylite.