It is very possible to search it. Although you can't do it from the forum itself. Follow these steps:
1) Open up another window(IE, Netscape, etc)
2) go to google.com
3) in the search field type
your search phrase site:www.darbasicpro.com
;where "your search phrase" is what you're looking for
4) click "google search"
You're done. A list of results should appear most of which will have "DarkBASIC" in the subject line. Just skim through these and you should find what you're looking for. It's not a perfect method but it does narrow the quest.
If you want fresh underwear in the morning, take it off the night before.