Among the most significant changes will be to Notifications Center, the built-in messaging system introduced with Mac OS X Mountain Lion. In addition to messages from the system, calendar and social media sites, Notification Center will add a "Today" view like that of iOS, serving as a kind of daily planner. It can show a summary of events for today and tomorrow along with weather, stock quotes and other information from the outside world. Yosemite widgets gives solution providers a mechanism for delivering small apps or enhancing existing apps with custom functionality.
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