Spiders
I think what you're really asking about is spiders, not search engines.
Spiders will start at whatever page they get directed in on, then crawl all of the links they find form that page on. They don't care if the page is ASP, PHP, CGI, JSP, or HTML. At some point, they figure out what pages are updated more frequently and start there.
This means that any page that you can click to via an HTML link can be found by a spider, provided it isn't stopped by robots.txt files. Forums won't create a problem because they can crawl all the links and get to all of the pages in most cases, such as this forum. It may take them a while because of how many pages a forum normally has, but more IBL's will make that process faster.
Brian.
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