Figure 1. The primary web page for Grateful Med, a free service of the National Library of Medicine. (The large bold numbers on the right were added by the author to label sections of the screen.) Each section of this web page has, when displayed in a web browser, a large italic I inside a colored square. When clicked, context-sensitive help will appear. Section 1 contains control buttons to restrict or to initiate a search. Section 2 contains text entry fields (the empty rectangles) and pop-up menus that specify to which database field the search term should be applied. Section 3 contains pop-up menus that can focus the search by several criteria.