The Access keys used by this site are designated as follows

Alt+U：Upper area on the top side, containing the links to the services of this site.
Alt+C：Main content area, containing important or related information of this site.
Alt+Z：Bottom Link area
Alt+S：Search box in every page for searching this site
Shift+Tab : Back to previous item on this
Powered tab key navigation order : Starting from the top menu links , Carried to the left of the main menu links , Then moved to the center of Main Content Area , Finally moved Related Links area on the right.