Screen shot of part of an index in a PDF file. Three index entries each consist of a heading (example, 'solution space'), followed by a locator (a number that references a page or a range of pages). The index headings are black text. All but one locator is a hyperlink. Hyperlinks appear as blue text. The cursor is over one hyperlink, and appears as a hand icon. One locator shows a range of pages. The first number is a hyperlink (blue text), but the second is not (black text). 

ref: chpi-v2006-11-01