I think the actual link was saved within your browser not within Lotus Notes and more on let’s say IE:
Internet Explorer 8
To remove a stored password or other stored information in Internet Explorer 8:
From the Tools menu, select Internet Options.
On the General tab, under “Browsing history”, click Delete… .
Check the item(s) you want to delete:
Temporary Internet files (copies of web pages, images, and media that are saved for faster viewing)
History (the lists of web sites you have visited)
Form data (saved information you have typed into forms)
InPrivate Filtering data (saved data used by InPrivate Filtering to detect where web sites may be automatically sharing details about your visit)
To delete everything, uncheck Preserve Favorites website data and check all the other options.