CipherLab 8500 Reference Manual page 28

8500 Series Mobile Computer
For the 44-key keypad, these keys can be categorized into the following groups by color:
Blue Area
Two [ENTER] keys: user-friendly and convenient for either right-handed or left-handed
operator to perform general function of a [Enter] key.
It can be used together with [RED] modifier key: [ENTER] + [RED] = alternately turn ON/OFF
the backlight of LCD and keypad.
Black Area
[POWER] key
Numeric keys
Modifier keys: [Shift] or [Alt] that modifies its next key. The functionality depends on software
application.
Others like [Backspace], [ESC], [Space], [Tab], [Insert], [Delete], [ - ], [ . ]
Yellow Area
[SCAN] trigger
Navigation keys for moving the cursor up, down, left, right.
Alphabetic keys
Others like punctuation keys for comma & semi-colon, dollar & colon.
Red Area
[RED] modifier key: the solid red key next to the Power key
[RED] followed by one red-coded key: The [RED] modifier key modifies (activates) the second
key. Its functionality is determined by the red-coded key, which is specified by red letters
under the navigation keys or on top of alpha keys and some punctuation keys.
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Reference Manual