How do you take full control of HTML generation from Domino?

From Andre Guirard:

Agents
The first thing the agent should do is:

  Print "Content-Type: text/plain

  Print "Content-Type: text/html"
  Print

Everything else you output from the agent is under your control.

Forms and Pages
Selecting the "Treat contents as HTML" form option will disable generation of any headers by Domino.

Views
Embed the view in a page that has "Treat contents as HTML" option selected. Select HTML display for the embedded view.