CPF was an example of a commercially- available [[Capabilitycapability-based operating system]]. System/38 was one of the few commercial computers with [[capability-based addressing]].<ref>{{cite book | chapter-url = http://www.cs.washington.edu/homes/levy/capabook/Chapter8.pdf | title = Capability-Based Computer Systems | chapter = The IBM System/38 | first = Henry M. | last = Levy | publisher = Digital Press | year = 1984 | isbn = 0-932376-22-3}}</ref> Capability-based addressing was removed in the follow-on [[OS/400]] operating system.<ref name = "Soltis2001">{{cite book | first1 = Frank G. | last1 = Soltis | url = https://books.google.com/books?id=ypJmzqt7JdUC | title = Fortress Rochester: The Inside Story of the IBM ISeries | page = 119 | publisher = 29th Street Press | date = July 2001 | isbn = 978-1-58304-083-6}}.</ref>
