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+[[!meta copyright="Copyright © 2010 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
+In an [[UNIX]]-like system, a *system call* (*syscall*) is used to request all
+kinds of functionality from the operating system kernel.
+A [[microkernel]]-based system typically won't offer a lot of system calls --
+apart from one central one, and that is *send message* -- but instead [[RPC]]s
+will be used instead.
+In the [[GNU Hurd|hurd]], a lot of what is traditionlly considered to be a UNIX
+system call is implemented (primarily by means of [[RPC]]) inside [[glibc]].