The menu bar and the Dock are available on each display.
On October 22, 2013, Apple offered free upgrades for life on OS X and iWork. During a keynote on October 22, 2013, Apple announced that the official release of 10.9 on the Mac App Store would be available immediately, and that unlike previous versions of OS X, 10.9 would be available at no charge to all users running Snow Leopard (10.6.8) or later.
OS X Mavericks was the first OS X major release to be a free upgrade and the second overall since Mac OS X 10.1 "Puma". It also removed some of the skeuomorphic designs from OS X Mountain Lion.
Mavericks, which was named after the surfing location in Northern California, was the first in the series of OS X releases named for places in Apple's home state earlier releases used the names of big cats.
The update emphasized battery life, Finder improvements, other improvements for power users, and continued iCloud integration, as well as bringing more of Apple's iOS apps to OS X. OS X Mavericks was announced on June 10, 2013, at WWDC 2013, and was released on October 22, 2013, worldwide. A handy “Send to” feature lets you beam routes and landmarks to your iPhone or iPad, so you can refer to them on the go.OS X Mavericks (version 10.9) is the 10th major release of macOS, Apple Inc.'s desktop and server operating system for Macintosh computers. There’s a desktop version of Maps, too this doesn’t offer much benefit over existing web-based services, but it provides consistency with the mobile experience. Even for casual reading, it’s worth having: if your iPad battery is getting low, you can switch to your laptop and pick up where you left off. Texts on your iPad or iPhone automatically sync to the desktop, complete with highlights and notes, so you can easily refer to them while revising or writing, and citations are generated automatically. The first is a desktop version of iBooks, which makes a lot of sense for students in particular. Mavericks comes with a few new apps that strengthen the relationship between the desktop and iOS devices. According to Apple’s figures, this can reduce CPU power usage by up to 23%, promising improved battery life for MacBook Air and MacBook Pro users. Mavericks also brings improved power-management features, including one – with the rather twee name App Nap – that automatically throttles CPU usage for background applications.