Posted on 12/07/2016 17:52:06
It is used internally by the PDF generation - DW generates the HTML in the context of the pageview instance that is being called with pdf=true and adds it to the cache. The PDF enginge then calls the PDFCache.aspx that returns that cache to generate the PDF document.
The reason this happens is that we want the context of the user (cart, logged in information etvc) that would not be available if we generated the PDF directly using a http call (which is how it works)
Hope this makes sense...