MSDN: Enterprise Search URL Syntax Reference

One of the most simple, yet powerful features of Microsoft SharePoint Search is the URL syntax. Using URL syntax you can submit a query to a search results page without requiring the use of a SharePoint search box. This means that search results can be rendered on a search results page any way that the proper URL string can be built.

For example, search queries may be submitted implicitly throughout the user experience as a user is navigating a SharePoint Web site. Hyperlinks (dynamic or static) containing search query parameters do all of the work.

The MSDN article, "Enterprise Search URL Syntax Reference, http://msdn.microsoft.com/en-us/library/aa637082.aspx," explains the proper format for submitting keywords, scope, view, and start page information through the query string.