You're right, Direct Hit is a crawler based engine. It's ranking algo. is based on clickthrough popularity, among other factors.
Direct Hit provides results for the following engines: MSN - option Ask Jeeves Lycos - some Iwon - some
For more information on Direct Hit, check out the search feature here at WmW...top lefthand corner "site search"... If you perform a search for "direct hit" you will find lots of great info. about Direct Hit that has been shared in the forum.
Hope this is helpful to you, and once again welcome!