--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os.rst	Mon Dec 09 00:32:24 2013 +0200
@@ -0,0 +1,17 @@
+.. -*- coding: utf-8; -*-
+.. include:: HEADER.rst
+
+===================
+ Operation system.
+===================
+.. contents::
+
+OS Market Share on Desktop.
+===========================
+
+  http://netmarketshare.com/
+                Web-based statistic.
+  http://en.wikipedia.org/wiki/Usage_share_of_operating_systems
+                Wikipedia.
+
+