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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
+License|/fdl]]."]]"""]]
+
+*Question:* Could it be possible to have a system installation where you can
+dual-boot using either the [[Linux]] kernel, or the GNU Hurd, so that
+everything but the kernel is shared?
+
+*Answer:* Given that both Linux and GNU Hurd are using the [[ELF]] binary
+format, this could indeed be made possible, if all programs agreed to rely on
+only one abstraction layer, for example the standard C library ([[glibc]]).
+(Additionally, for example for system calls that are not covered by glibc
+calls, you'd need to be able to reliably trap and emulate these.)  However,
+Linux' and the GNU Hurd's [[ABI]]'s have sufficiently diverged, so that this is
+not easy to do.  That's why you can't currently install a system in this way,
+but you need a separate installation of the userspace suited for the Linux
+kernel, or the GNU Hurd.