<A HREF="newwindow.html" TARGET="_blank">a new window</A>
This value does not require the use of any frames. "_blank" is popular in web pages which are devoted to links to "other resources on the net". By opening a new window for each resource, the user has a sense of a "main" page (the list of resources) and "secondary" pages (each individual resource). However, this results in cluttering the computer screen, which may irritate some of your readers.