This provides an easy way to build sets of hypertext documents. If several hypertext documents are sitting in a common directory, they can refer to one another (i.e., they can be hyperlinked) by just their filenames -- no matter the browser reached one of the documents, a hyperlink to any other document in that directory can be created by merely using the other document's filename as the partial URL. The additional information (access method, hostname, directory name, etc.) will be assumed based on the URL used to reach the first document.