should mention this is restricted to i686 and x86_64; ia64 doesn't support Windows as a guest
note added: <important><title><trademark class="registered">Itanium</trademark> support</title><para>Presently, Red Hat Enterprise Linux hosts on the <trademark class="registered">Itanium</trademark> architecture do not support fully virtualized windows guests. This section only applies to x86 and x86-64 hosts.</para></important>