The Parameter Packet is a location in application storage where the physical mouse device driver returns the current pointer shape, a user buffer described by the data in the Data Packet.

┌───────────────────────────────────────────┐
│Field               Length     C Datatype  │
├───────────────────────────────────────────┤
│Buffer Length       WORD       USHORT      │
├───────────────────────────────────────────┤
│Columns             WORD       USHORT      │
├───────────────────────────────────────────┤
│Rows                WORD       USHORT      │
├───────────────────────────────────────────┤
│Column Hot Spot     WORD       USHORT      │
├───────────────────────────────────────────┤
│Row Hot Spot        WORD       USHORT      │
└───────────────────────────────────────────┘