Hi Kedar: The book by Andrews you gave me is very good. It gives a good historical perspective on some of Crista's work. It references: @BOOK{maekawa:path-expressions, AUTHOR = "M. Maekawa and A. E. Oldehoeft and R. R. Oldehoeft", TITLE = "Operating Systems: Advanced Concepts", PUBLISHER = "Benjamin/Cummings, Redwood City, CA.", YEAR = "1987" } which is supposed to contain something related to coordinator objects (they call it predicate path expressions). Please can you get me this book as well. -- Karl