Well, my point is this: If only three or four OSes have ever implemented it, none of which have been very successful, how important could it possibly be? Do oth

Well, my point is this: If only three or four OSes have ever implemented it, none of which have been very successful, how important could it possibly be? Do other OSes have ways of making the problem irrelevant without actually fixing it like ITS, Fluke, and EROS did?