Dear Ann,
if one uses the context bar provided by e.g. https://openacs.org/api-doc/proc-view?proc=ad_context_bar&source_p=1, no permission checks are executed, the site nodes are just visited for the links to be constructed.
An example of such bar is this very forum entry, where as you can see even not logged in people can click on the top context bar up to the whole forum and the whole page.
Does this help?
Antonio
