OID_IRDA_MAX_UNICAST_LIST_SIZE
The OID_IRDA_MAX_UNICAST_LIST_SIZE OID is optional for most IrDA miniport drivers. Only Windows 95/98/Me IrDA miniport drivers that maintain a UNICAST list must support this OID.
This OID requests the maximum number of entries in the miniport driver's UNICAST list. A UNICAST list is a list of the miniport driver's devices from which the miniport driver accepts frames. For more information, see the description for OID_IRDA_UNICAST_LIST.