The Data Packet is a location in application storage where the physical mouse device driver returns the mouse device's motion sensitivity to the caller. The format of the Data Packet is as follows:

┌──────────────────────────────────────────────┐
│Field                  Length     C Datatype  │
├──────────────────────────────────────────────┤
│Mickeys/Centimeter     WORD       USHORT      │
└──────────────────────────────────────────────┘