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This document describes an extension to the int33 API to allow users to detect
if mouse interrupts come from a relative-input device (like a standard mouse)
or an absolute-input device (like a tablet, or an emulator like VirtualBox).
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Changes in the original INT 33h functions:
INT 33/000C - Define User Interrupt Routine
INT 33/0014 - Exchange User Interrupt Routines
Bitfields for mouse call mask:
Bit(s) Description
0-6 same as Table 03171 (as in int33.lst)
7 (for vertical wheel movement -- seee wheelapi.txt)
8 absolute mouse event
9-15 unused
Notes: when the user interrupt routine is called, bit 8 of CX indicates that
the x, y coordinates passed in CX, DX come from an absolute pointing
device (and therefore that the mickey counts in SI, DI may be zero or
virtualized).
bit 8 will not be set unless the user also sets bits 8 in the event mask
passed to int33/000c or int33/0014. However, setting or clearing bit 8
in the event mask shall have no other effect.
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