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 │ └───────────────────────────────────────────┘