To set a hyperlink for a feature, click on that feature with the Identify tool. Right-click the feature name in the Identify dialog box and choose Add hyperlink from the context menu. Specify the desired type of hyperlink target. To hyperlink to a Web page, click Link to a URL and type the URL. To link to a PDF, Microsoft Word, or other document, click Link to a Document and type a path to the document or browse to its location. For dynamic hyperlinks, relative paths are supported for map layers but not for .lyr files. Access dynamic hyperlinks by clicking the feature with the Identify tool, right-clicking to access the context menu, and choosing Hyperlinks.
With ArcGIS 9.3, a parameter can be set to control how a hyperlinked document is opened by specifying the page that will be opened. For example, c:\temp\PopulationData.pdf ?/A "Page=5=OpenActions" would open the PopulationData.pdf document at page 5. ArcGIS uses a question mark (?) as a special delimiter to separate the file path from the parameter. In this case, c: \Program Files\Adobe Reader 8.0\Reader\AcroRd32.3exe. is the location of the software, /A "Page=5=OpenActions" is the open parameter, and c:\temp\PopulationData.pdf is the location of the file.