The demo is not yet complete, so here is a brief explanation:

Method 1 - Navigate through the brochures section to find the menu that contains the document that you require. Then, RIGHT CLICK the title and choose OPEN LINK IN NEW WINDOW. When the new window opens, you can copy the URL from the address bar of your browser.

Method 2 - Navigate through the PRODUCTS section to find the product that you need literature on, there is always a link to the related literature at the bottom of the main page for that product (not dimension or detail pages)
these links open in a new window automatically so you will be able to copy the URL from the address bar to send as a link.