Enterprise Search Keyword Syntax Reference
Enterprise Search in Microsoft Office SharePoint Server 2007 includes new keyword syntax for building keyword queries. This syntax is simpler to use than the SQL search syntax because you do not have to parse through search terms to build a SQL statement; you pass the search terms directly to the search service.
You can pass two types of terms in an Enterprise Search keyword query:
Enterprise Search Keywords (the actual query words for the search request)
Enterprise Search Property Filters (the property constraints for the search request)