[[meta copyright="Copyright © 2007, 2008 Free Software Foundation, Inc."]] [[meta license="""[[toggle id="license" text="GFDL 1.2+"]][[toggleable id="license" text="Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled [[GNU_Free_Documentation_License|/fdl]]."]]"""]] Mach's [[microkernel/mach/external_pager_mechanism]]. Mach [[microkernel/mach/IPC]]'s [[microkernel/mach/ipc/sequence_numbering]]. [GNU Hurd Reference Manual: 4.2 Pager Library](http://www.gnu.org/software/hurd/doc/hurd_5.html#SEC32).