[NTG-context] Thumbtabs on edge of pages.

Apparently this facility exists in primitive form via some special styles in LaTeX. Is there any facility for same in Context? Ideally the thumbtabs would line up with the corresponding chapter entries in the first (summary) TOC. Of course one can always cobble something up, but I am hoping that someone has already done the cobbling. -- John Culleton Able Indexers and Typesetters http://wexfordpress.com