1. A system for viewing product information, comprising: a web server configured to run on a first computer; a product information database including information describing a hierarchical relationship between groups of products, said product information database stored on a computer storage media, said web server having access to said product information database; a web browser configured to run on a second computer, said web browser configured to generate a user interface, said user interface displaying icons representing said groups of products, said icons arranged to visually represent said relationship between said groups of products, said web browser configured to send a network message over a network to said web server in response to selection by a user of the second computer of one of said icons representing a first of said groups of products, said network message including a database query command that specifies a query of said product information database for related groups of products having said relationship to said first group of products; and said web server configured to submit said query to said product information database, and to return to said web browser a web page including results of said query, said web page including information describing said related groups of products, said web browser configured to extract said information describing said related groups of products and to display second icons representing said related groups of products.