Index: /trunk/doc/manual/en_US/user_GuestAdditions.xml
===================================================================
--- /trunk/doc/manual/en_US/user_GuestAdditions.xml	(revision 38031)
+++ /trunk/doc/manual/en_US/user_GuestAdditions.xml	(revision 38032)
@@ -230,6 +230,8 @@
 
         <note>
-          <para>For Direct 3D acceleration to work in a Windows Guest, you
-          must install the Guest Additions in "Safe Mode"; see <xref
+          <para>For the basic Direct 3D acceleration to work in a Windows Guest, you
+          must install the Guest Additions in "Safe Mode".
+          This does NOT apply to experimental WDDM Direct 3D video driver available for 
+          Vista and Windows 7 guests. see <xref
           linkend="KnownIssues" /> for details.</para>
         </note>
@@ -1121,5 +1123,7 @@
           2.1; support for Linux and Solaris followed with VirtualBox 2.2.
           With VirtualBox 3.0, Direct3D 8/9 support was added for Windows
-          guests. OpenGL 2.0 is now supported as well.</para>
+          guests. OpenGL 2.0 is now supported as well.
+          With VirtualBox 4.1 Windows Aero theme support is added for 
+          Windows Vista and Windows 7 guests (experimental)</para>
         </footnote></para>
 
@@ -1160,10 +1164,13 @@
           <listitem>
             <para>The Guest Additions must be installed.<note>
-                <para>For Direct 3D acceleration to work in a Windows Guest,
+                <para>For the basic Direct 3D acceleration to work in a Windows Guest,
                 VirtualBox needs to replace Windows system files in the
                 virtual machine. As a result, the Guest Additions installation
                 program offers Direct 3D acceleration as an option that must
                 be explicitly enabled. Also, you must install the Guest
-                Additions in "Safe Mode"; see <xref linkend="KnownIssues" />
+                Additions in "Safe Mode".
+                <note><para>This does NOT apply to experimental WDDM Direct 3D video driver 
+                available for Vista and Windows 7 guests.</para></note> 
+                See <xref linkend="KnownIssues" />
                 for details.</para>
               </note></para>
@@ -1183,4 +1190,29 @@
           </listitem>
         </orderedlist></para>
+
+      <para>With VirtualBox 4.1 Windows Aero theme support is added for
+      Windows Vista and Windows 7 guests. To enable Aero theme support, 
+      the experimental VirtualBox WDDM video driver must be installed, 
+      which is available with the Guest Additions installation.
+      Since WDDM video driver is still experimental at this time, it is
+      not installed by default and must be <emphasis role="bold">manually
+      selected</emphasis> in the Guest Additions installer by answering "No"
+      int the "Would you like to install basic Direct3D support" dialog 
+      displayed when the Direct 3D feature is selected.
+      <note><para>Unlike current basic Direct 3D support, WDDM video driver
+      installation does NOT require "Safe Mode"</para></note>
+      <note><para>Aero theme is not enabled by default, to enable it<itemizedlist>
+          <listitem>
+            <para>In Windows Vista guest: right-click on the desktop, in the 
+            contect menu select "Personalize", then select "Windows Color and Appearance"
+            in the "Personalization" window, in the "Appearance Settings" dialog select 
+            "Windows Aero" and press "OK"</para></listitem>
+          <listitem>
+            <para>In Windows 7 guest: right-click on the desktop, in the 
+            contect menu select "Personalize" and select any Aero theme
+            in the "Personalization" window</para></listitem>
+          </itemizedlist>
+        </para></note>
+      </para>
 
       <para>Technically, VirtualBox implements this by installing an
Index: /trunk/doc/manual/en_US/user_KnownIssues.xml
===================================================================
--- /trunk/doc/manual/en_US/user_KnownIssues.xml	(revision 38031)
+++ /trunk/doc/manual/en_US/user_KnownIssues.xml	(revision 38032)
@@ -41,5 +41,5 @@
 
     <listitem>
-      <para>For <emphasis role="bold">Direct3D support in Windows
+      <para>For <emphasis role="bold">basic Direct3D support in Windows
       guests</emphasis> to work, the Guest Additions must be installed in
       Windows "safe mode". Press F8 when the Windows guest is booting and
@@ -47,5 +47,8 @@
       file protection mechanism will interfere with the replacement DLLs
       installed by VirtualBox and keep restoring the original Windows system
-      DLLs.</para>
+      DLLs.
+      <note><para>This does NOT apply to experimental WDDM Direct 3D video driver 
+        available for Vista and Windows 7 guests.</para></note> 
+      </para>
     </listitem>