A lot of collaboration happening on the Web between people consists in exchanging written messages. In fact, for years, it was the only way people could interact via the Web. Now, since the Web has become a software platform through which we can build and propose any kind of applications, collaborations happen in many different ways, and people on the Web have an open-ended set of possibilities of interaction with the Web and with other people. The long-term goal of the Agents on the Web effort should be that artificial agents can deal with all these possibilities, with sufficient guidelines provided by explanatory resources like metadata, ontologies, etc. However, a framework that would allow all agents to exploit any and all possible interactive resources on the Web in their generality would be as difficult to design as a general AI.