[development] Multiple search blocks doing different searches.

Hi, My goal is to set up a tabbed search block which I'll use Quick Tabs to build, where each tab will prime the search with a keyword. The step before this though is to have multiple blocks that do slightly different searches. Defining the blocks is easy enough but I can't use hook_db_rewrite_sql (an example from searching at [1]) as I don't know what block is calling it. Is there some easy way or trick around this or do I just have to manually call do_search, or write my own search, for each block? Thanks, Anthony [1] http://www.lullabot.com/articles/hiding-content-drupals-search-system