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Table 525

Bitfields for pointing device status:
Bit(s)	Description	)
 15-8	reserved (0)
 7	Y data overflowed
 6	X data overflowed
 5	Y data is negative
 4	X data is negative
 3	reserved (1)
 2	reserved (0)
 1	right button pressed
 0	left button pressed

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