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well, for number 1, back when it first came out when it was asked, that's why they don't allow writing on the device due to low res of the touch screen. which I find kinda silly,
the second part, it should be able to draw on the whole screen before a refresh, but this is not a feature of the device, you cant write on it. the flash cleans the lines. without the refresh its can be very jagged
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