We are committed to ensuring that this site is accessible to all visitors.：
Top menu linking zone
The left-sided linking zone.
Main Content Area
The Accesskeys used by this site are designated as follows:：
Alt+U (IE), Alt+Shift+U (Firefox)：Top menu linking zone lists function menu.。
Alt+L (IE), Alt+Shift+L (Firefox)：The left-sided linking zone lists every units link.。
Alt+C (IE), Alt+Shift+C (Firefox)：Main Content Area showing each page information.。