Both,
Global is call in your pages via the global name tag <%random_link%>

('random_link', $link); is the Template name.

Global displays the random_link.html template which holds what you want to display.
i.e. Logo for instance
<a href="<%db_cgi_url%>/jump.cgi?ID=<%ID%>" target="_blank">
<img src="<%build_images_url%>/logo/<%Logo%>" border="0" width="120" height="90"></a>

So place the <%random_link%> on the page were you want the random link to be displayed.
Make up a template with the code you need displayed [ as above] and put the random_link.html template in the template directory.
Change the global to display 5,10 or how many links you want and it should be good to go.

Regards

minesite