Abstract: A secure robust protective enclosure for a portable electronic display device that incorporates a sufficiently ridged transparent window so as to limit the user interface to push buttons located on the front of the enclosure. The enclosure's control buttons mechanically actuate corresponding control buttons on the enclosed portable electronic display device. When only two control buttons are used, the user interface is simplified to reduce the training required to use the device. The user interface button or buttons are labeled via shape, color and a numeral, to assist in language-neutral identification of the control button's function. Typically one button functions as a “tab key” that cycles through the available choices that are shown on the portable electronic display device's display screen and the other button functions as a “enter key” that activates the selected choice.