When you first install the Adbar Management System and add the appropriate #exec cgi or #exec cmd tag to your web pages, the adbars displayed will all be chosen from the group called "--Default--". If you don't set up any relations that point to a particular HTML page or directory, those pages will always display whatever adbars are listed in the "--Default--" group.
This makes for an easy way to get adbars up and running everywhere on your site quickly. Simply add all of your adbars into the "--Default--" group, and only set up relations in special cases.
For example, if you wanted to give a certain advertiser exclusive exposure on the main page of your site, you would set up a relation named "Main_Page_Exclusive" or something similar, select just that one advertiser, then list the relative URL of the main page in the "Page URLs" section:
/index.html
Then the main page would show just that adbar, while the rest of the site would pick from everything listed in the "--Default--" group.
Giving Prominence to a Specific Adbar
You could also do something where you give prominence to a specific adbar, but also display the adbars from the "--Default--" group. Set up a relation and select the adbar that you want to give prominence to from the advertiser list. Then also select the "--Default--" group from the group list. And, of course, add in a Page URL or Rule:
/index.html
Now the adbar that you are giving prominence to has a 50% chance of being displayed, and there is a 50% chance that the AMS will pick an adbar from the "--Default--" group.
