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DP INPUTBUTTONS
From Quake Wiki
Field definitions:
.float button3; .float button4; .float button5; .float button6; .float button7; .float button8;
Set to the state of the +button3, +button4, +button5, +button6, +button7, and +button8 buttons from the client, this does not involve protocol changes (the extra 6 button bits were simply not used).