Mathcad, by Mathsoft Engineering & Education, Inc., is a leading calculation and technical documentation tool for professional and educational users. Mathcad uses standard math notation as its interface. Files can be saved as dual-purpose web documents, incorporating both presentation and semantic forms of MathML. They can be viewed on the web using IBM techexplorer Hypermedia Browser and reimported from the web by Mathcad as live mathematical documents. On the accompanying screenshot, the same document is shown in Mathcad and a web browser equipped with IBM techexplorer Hypermedia Browser. The image shows how Mathcad can be launched directly from the browser for further editing and calculation of the MathML document.