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The provided cover when closed and placed in a pocket will apply pressure to the hardware buttons especially the Up/Down buttons. This causes alarms to never sound when they are activated. Instead all you hear is an annoying clicking sound (if your hearing is good) of the button being pressed.
PalmVHack provides you with more control than OS upgrade 3.1.1 which only fixes the Page-Up key. PalmVHack allows you to select which buttons you would like ignored. Page-Up, Page-Down and the Application Buttons. You can even override OS upgrade 3.1.1 and re-activate the Page-Up key with PalmVHack.