>>>
>>>Do you know how can I delete a symbol using the Scanner? I could not find a way to delete the symbol if I type it incorrectly. Also my Clear button doesn't clear anymore - used to work.
>>
>>Sorry, that's scanner specific. No idea.
>
>I think the keyboard on these devices should be pretty standard.

Nope. You can't even count on them having keyboards. Some are touchscreen and have the keypad of a cellphone. Others don't have any keys at all. Mappings of special function keys are all over the map.