The Data Packet is a location in application storage where the physical mouse device driver returns to the caller the current pointer screen position. The format of the Data Packet is as follows:

┌───────────────────────────────────────────┐
│Field               Length     C Datatype  │
├───────────────────────────────────────────┤
│Row Position        WORD       USHORT      │
├───────────────────────────────────────────┤
│Column Position     WORD       USHORT      │
└───────────────────────────────────────────┘