Possibly a cross between MicrosoftFrontPage and WysiwygWiki... the jury's still out.
- http://www.macromedia.com/software/contribute/
- http://www.macromedia.com/macromedia/proom/pr/2002/contribute_ship.html
(It's actually more like a cross between your favorite web browser and a database-form Content Management System... a permitted content contributor can edit the page while they're looking at it.)
See MacroMedia