It possible to use links for various issues. e.g. for icons in your hep text.

If you use pictures from your TIS-Server it is preferable to use relative paths.
Otherwise a change of the server or a transfer to another server causes problems.

   <img src="./res/silk/add.gif">

which corresponds to

A good way (provided you have developer rights) open the properties of a page in the left tree (right mouse):

You will see a list of icons: with mouse over you see the text "icon" - and the name of the icon (take path and extension from the example above.)