In creating complex interactive documents, some technical communicators use software products that emphasize format and style in displaying pages. This approach limits the communicator's ability to repackage the information presented in electronic versions and increase its interactive use, which is a key benefit of the structure-based approach offered by using Standard Generalized Markup Language (SGML). In a number of projects that render mathematical, scientific, and engineering texts electronically, using SGML allows the technical communicator to make equations interactive and to automate links to references. The author sketches out problems associated with page description approaches to displaying electronic pages and discusses the comparative benefits of SGML.