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