Front ends handling help.search() results?

Which front ends process the help.search() results to produce nice
clickable lists, instead of the simple text display that's the default?
I know the R.app gui on  Mac OS does; are there others?

RKWard does, too. (More precisely: It has a UI for searching help files, which 
relies on help.search()).

I'm asking because one of the decisions made when R Core met in Vienna
was to allow vignettes to be returned as results of help.search().  All
of those front ends will need to be able to handle this.

Will this affect the structure of the hsearch class?

Currently, our implementation for showing an item from the result list is to 
simply call help(help_type="html"), appropriately. What are the implications 
of vignettes for the behavior of help(), if any (with or without specification 
of help_type)?

Regards
Thomas
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