QueryService Class
Windows SharePoint Services 3
The QueryService class is the entry point for calling the Enterprise Search in Microsoft Office SharePoint Server 2007 Query web service.
Web Service: SearchWeb Reference: http://<Site>/_vti_bin/Search.asmx
To access the Search Query web service and its methods, set a Web reference to:
http://Server_Name/[sites]/[Site_Name]/_vti_bin/search.asmx
You can find step-by-step instructions for this with Visual Studio 2005 in the How to: Create a Web Service Proxy Class for the Enterprise Search Query Web Service in Visual Studio 2005 topic.