  Multimodal interfaces are becoming increasingly important with the advent of
mobile devices, accessibility considerations, and novel software technologies
that combine diverse interaction media. This article investigates systems
support for web browsing in a multimodal interface. Specifically, we outline
the design and implementation of a software framework that integrates hyperlink
and speech modes of interaction. Instead of viewing speech as merely an
alternative interaction medium, the framework uses it to support out-of-turn
interaction, providing a flexibility of information access not possible with
hyperlinks alone. This approach enables the creation of websites that adapt to
the needs of users, yet permits the designer fine-grained control over what
interactions to support. Design methodology, implementation details, and two
case studies are presented.
