API GetInventoryItemID

Returns the item id of the item in the specified inventory slot itemId, unknown = GetInventoryItemID("unit", invSlot);

Arguments

 * unit : String - The UnitId of the unit whose inventory is to be queried.
 * invSlot : Number (InventorySlotId) - index of the inventory slot to query.

Returns

 * itemId: Number - item id of the item in the inventory slot; nil if there is no item.
 * unknown: Number - ?