Forum OpenACS Q&A: Response to How to get an instance url from a package key?
So your package wants to include redirects to adserver or clickthrough or all sorts of things that may not be mounted relative to your package. If the target is not a singleton, and if the context isn't specified by user_id or something similar, how can anything determine the proper URL.
I don't know if this has been solved or not. I solved it in the limited case of the adserver as the adserver was a singleton. But I can certainly imagine cases when the adserver is not a singleton, you want different ads (and maybe different adserver instances) depending on the subsite, or gender, or zip code, or time of day, referrer_url, shopping cart contents, .... What sort of things can be done by the implementor to address this?