The Data Packet is a location in application storage where the mouse device driver returns to the caller a 10-byte mouse event queue record. A mouse event queue record has the following format:
┌───────────────────────────────────────────┐ │Field Length C Datatype │ ├───────────────────────────────────────────┤ │Event Mask WORD USHORT │ ├───────────────────────────────────────────┤ │Time DWORD ULONG │ ├───────────────────────────────────────────┤ │Row Position WORD USHORT │ ├───────────────────────────────────────────┤ │Column Position WORD USHORT │ └───────────────────────────────────────────┘