--- a/windows.rst	Sun Feb 28 23:03:35 2010 +0200
+++ b/windows.rst	Tue Mar 02 13:50:52 2010 +0200
@@ -53,6 +53,11 @@
 
   http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/net_use.mspx
 
+** Activate windows.
+
+  http://www.microsoft.com/genuine/selfhelp/XPPkuinst.aspx?sGuid=bab9e103-6365-44dd-9337-93f0cd9dd4b7&displaylang=en
+                Windows Product Key Update Tool Instructions
+
 * Vista
 
 ** Samba.
@@ -105,3 +110,20 @@
 To remove:
 
   cmd> subst disk: /d
+
+* CMD.
+
+** How run cmd on 64-bit OS.
+
+From 64-bit process:
+
+  %windir%\System32\cmd.exe (for 64-bit)
+  %windir%\SysWOW64\cmd.exe (for 32-bit)
+
+From 32-bit process:
+
+  %windir%\System32\cmd.exe (for 32-bit)
+  %windir%\Sysnative\cmd.exe (for 64-bit)
+
+  http://msdn.microsoft.com/en-us/library/aa384187%28VS.85%29.aspx
+                File System Redirector