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The login information you insert for the client created in the default banner system of XOOPS creates an account for that user to access your site through the path: yourxoopsroot.com/banners.php
Your client logs in with the access you created and it displays a simple statistics for your client to know how many clicks the banner has had, the statistics won't work for flash banners though.
There is another module called RW-Banner, that permits you to place several banner sections and in different ways in your theme, this is a more complex system.
www.polymorphee.com
www.xoopsdesign.com