To turn the dynamic urls into static that the spiders can index you can on Linux servers use the Mod re_write command to remove the wildcard characters etc. It also involves the .htaccess file is an ASCII text document that can be placed in any directory on your site. It can be used to control access to files and directories, and customise some server operation in your site.

Google it.

Static URL known as the favourite URL for the SE spiders and you can convert your dynamic URL to Static by using Mod_rewrite.

The difference between static and dynamic pages becomes significant when arguments appear in the stem. ie /index.php?ac=1&dc=2 etc.

The proposition is that there is additional overhead involved, so crawling occurs at a moderate pace to prevent loading the server unnecessarily. Google thus far, will index content (at a slower rate) with up to 2 args (as above).

It's not about whether content is dynamically generated (ie the bot could see this in the response headers where php for example may be reported as the generator of the page).

It's simply about load. Hence, if you have both static and dynamic content (as determined by the extension and/or presence of args) the static content will be readily indexed by google, while dynamic content is indexed at a slower rate.

Look at the bottom of this forum.. you'll see 'Library'. Googlebot would prefer to chew on that, than this forums dynamic content. Of course, once a site is popular and has a decent PR, the equation does change somewhat..