Check out this archived article from BlitzCoder. It's Title says "Blitz2D" but it is still relevant to Blitz3D:
Blitz2D Newbies: Definitive Guide to Types:
http://web.archive.org/web/20050319160810/www.blitzcoder.com/cgi-bin/articles/show_article.pl?f=mutteringgoblin09232002232208.html
Blitz2D Newbies: Definitive Guide to Types:
http://web.archive.org/web/20050319160810/www.blitzcoder.com/cgi-bin/articles/show_article.pl?f=mutteringgoblin09232002232208.html