Consigned Stock, MB54 and Quantity on Hand

Hi Experts -- am I correct to understand that MB54 measures the quantity of consigned material in special stock (some call this K Stock)?  Thus, MB54 would not measure any consigned material that had been transferred to Unrestricted Use?  What does Quantity on Hand refer to in regard to consigned materials, is it the quantity in special stock (K Stock) or is unrestricted use quantity?  Finally what is the difference between quantities reported in the initial result screen for MB54 versus the Total Vendor display?

Thanks

Doug