In place of the Android Menu button, a small three-dot icon appears in all apps and this opens the menu.

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For starters, Blur has a different 3G icon in the menu bar, and different icons for several apps -- Calendar leaps out to us here.

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From the second you select the Twitter for BlackBerry icon from the main menu, it's apparent that RIM is focused on basic functionality.

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If the icon doesn't provide a menu, press Ctrl-Alt-Delete, select the name of the tray application, and click the End Task button.

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Users can still switch to a more traditional desktop mode by clicking on an icon, but the environment lacks the start menu button offered since Windows 95.

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An icon at the rightmost side of the OS X Menu Bar lets you shove your entire workspace over to the left, making room for a running list of alerts you may have missed.

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