Apple Wireless Keyboard the initial release. The new model now uses only two AA batteries instead of three originally. Additionally, Mac OS X 10.5.8 is now the minimum OS over the original Mac OS X 10.4.10. This model of keyboard became standard with new generation of iMacs introduced on the same day. On July 20, 2011, following the release of Mac OS X 10.7/OS X Lion, Apple updated the keyboard slightly, updating the label on the Exposé key to Mission Control and changing the Dashboard key to a Launchpad key. Keyboard layouts with a rectangular Enter key are available in American English and
Keyboard layout holding a modifier key with one hand leaves the other hand free to strike another key. An alphanumeric key labeled with only a single letter (usually the capital form) can generally be struck to type either a lower case or capital letter, the latter requiring the simultaneous holding of the key. The key is also used to type the upper of two symbols engraved on a given key, the lower being typed without using the modifier key. The English alphanumeric keyboard has a dedicated key for each of the letters A–Z, along with keys for punctuation and other symbols. In