A query can consist of one or more keywords in glimpse format (e.g. "foo;bar" finds all articles with both "foo" and "bar" in the same line) and it will return a list of every line in every file in my public files that matches the query. If you click on the line number in the query results, your browser will jump to the corresponding line in the original file.
More information is available in the help file (you might want to jump straight to the section on patterns).