NN is a number that you will see at the very end of the hyperlink. You will see the hyperlink in your browser's status bar, as I explained in my own explanation in the message immediately preceding the one from which you just quoted.
If you do not have a status bar in your browser, see if there is one you can enable (in IE it may be turned off), or if you can't figure that out, then see if you can copy the link and paste it into the address bar or a text editor to see it. You can copy a link in IE, Internet Explorer, by pointing to it, right-click on it, and select Copy Shortcut.
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