## Physical Device Driver Reference

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### MOU_SETEVENTMASK (54h) - Event Mask

Event Mask Has the following bits:

Bits 7-15 Reserved. Set to 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.