This website was constructed with accessibility in mind. Navigation links are grouped into four major block：
1.Top block. 2.Left block. 3.Main content. 4.Bottom block.
The accesskeys, also known as shortcut keys, are defined as follows.
Alt+U : Top block, containing links to the major sections and services of this site.
Alt+L : Left block, containing links to the sub-sections of this site.
Alt+C : Main content, providing the principal information of the page.
Alt+R :Right block, containing links to the sub-sections of this site.
Alt+B: Bottom block, containing all other links for the site.