[NTG-context] Simple but frustrating cross reference problem

Hello all. I have a very simple challenge: I want to insert a reference point in a document, so that I can later refer to the page number at that point, but I'm not outputting a sectioning or start... command at the point in question. I'm looking for something like \referencepoint[label] that can just be dropped anywhere in text so that I can later say \at{page }[label] and produce its page number. I have searched documentation, and what I can of sources, in vain. Thanks for any help. Duncan