The parameter packet is a location in application storage where the caller indicates the action to be taken if no event queue data is available. The format of the parameter packet is as follows:
┌─────────────────────────────────────┐ │Field Length C Datatype │ ├─────────────────────────────────────┤ │Read type WORD USHORT │ └─────────────────────────────────────┘