We thank Ken Lang for providing much of the software for learning over pages of text, and for suggesting the idea of implementing the agent by dynamically editing web pages. Thanks to Michael Mauldin for software and advice on the construction of a web-based text-retrieval system. We are grateful to Rich Caruana and Ken Lang for helpful comments on this paper. This research is supported by a Rotary International fellowship grant, an NSF graduate fellowship, and by Arpa under grant number F33615-93-1-1330.