This might be the ideal, but many organisations or individuals simply do not have the time: on-line help wouldn't get done if the documentation effort had to be doubled. However, Tex2RTF does provide some commands to allow tailoring the documentation to printed or on-line form, such as \helponly and \helpignore. An awareness of the design issues should go a long way to making the compromise a good one, so a book such as Developing On-line Help for Windows [1] is highly recommended.