File Menu To open a document directly,
Remember that a URL is a protocol type (e.g., http, gopher), server name, and file name convention that tells NCSA Mosaic where a document is located. Typically, someone tells you the URL of a document and you enter the string of characters. (See Introducing the World Wide Web for more information.)
URL Field If you have Show URL selected on the Options menu, you can enter URLs in the URL field at the top of the Mosaic window. Highlight or backspace over the existing URL and enter the new URL. Press RETURN to activate the link.