Most search engines cannot list any dynamic URLs. Dynamic URLs are most commonly used on database driven sites, or sites that are running scripts. They commonly look something like this one from MSN Search:

 http://search.msn.com/results.asp?q=dynamic+url

If your URL contains any of the following elements it is considered a Dynamic URL as far as the search engines are concerned:

?, &, %, +, =, $, cgi-bin, .cgi (commas above are just used as a separator)

If your URL contains any of the above elements it is very unlikely that it will get listed at any of the major search engines. We recommend that you submitting a different URL that is not dynamic if possible or use URL rewrite new technology . If all of your URLs are dynamic you should probably consider making static pages (i.e. not dynamic) with URLs that do not contain any of the elements noted above so that you can get listed in the search engines.