## Physical Device Driver Reference

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### MOU_GETEVENTMASK (65h) - Event Mask

Event Mask Has the following bit level definitions:

Bits 7-15 Reserved. Must be 0.
Bit 6 Set, if Button 3 is down.
Bit 5 Set, if motion, with Button 3 down.
Bit 4 Set, if Button 2 is down.
Bit 3 Set, if motion, with Button 2 down.
Bit 2 Set, if Button 1 is down.
Bit 1 Set, if motion, with Button 1 down.
Bit 0 Set, if all mouse motion, no buttons down.

A set bit has a value of 1.