I hear a great deal about e-mail as support for remote collaboration. Even if the e-mail is archived, however, it is seldom suitable for newcomers without the shared background of the correspondents. During the Keykos development the developers were within talking distance. Questions would be vocal but usually the responses would be disambiguation of the online documentation. A question would be followed a few minutes later with another question: “Is the manual clear now?”, or “Where were you looking in the manual for your information?”. This was effective in debugging the documentation.