I would like to create PDF bookmarks in my ConTeXt document, but I do not
want my document arranged in "normal" chapter/sections.  I know that I can
do

\setupinteraction[state=start]
\placebookmarks[chapter,section,subsection][chapter,section]
\setupinteractionscreen[option=bookmark]

and then in my document I can do

\chapter{Foo}

In this case, my PDF bookmark appears as "1 Foo".  Furthermore, in the
document itself, the chapter heading shows as "1 Foo".  I would like the
bookmark to just appear as "Foo" and I do not want ANY chapter/section
headings when I issue the \chapter{Foo} or \section{Bar} commands.  That
is, in the document, I would like those commands to basically JUST create
the bookmarks and have the bookmarks omit the chapter/section number.

Troy