The software allows any number of documents to be added, either about the catalogue, about a category or range in the catalogue, or about an item in the catalogue.
If a document or documents exist about a catalogue or category/range
then a 
button
is visible.
Clicking on a
button will cause the Document Selection Panel to appear
Click on the down arrow to see a list of all documents
Click on a document name to select it
Click the "View" button to view the document.
Note:-Clicking on "View" fires another web page to display the
document.
If this page opens full screen, either resize it or close it to see
the catalogue below.