About BusySync With BusySync it's incredibly easy to share calendars with family or coworkers without the need for a dedicated server. Shared calendars can be viewed and edited by multiple users and changes are instantly published and synchronized with all users on the network. BusySync is a Mac OS X System Preference Pane that runs in the background and adds calendar sharing capabilities to iCal. Leveraging Apple Sync Services and Bonjour, calendar events created by one user are instantly published and synchronized with other iCal users on the network. Users can share and edit calendars, make changes on each others calendars, and everything is automatically synchronized between each user, on each Mac.
Source >>