> the users hands these out manually).
Without wanting to go "no true Scotsman" on this discussion, the implied involvement of a user requires greater analysis.
To what extent do we expect a user to interact with URIs? While I'm happy to discuss the implications on usability, I personally don't expect a user to be so intimately involved in the process.
More likely, to my mind, is this sort of question: "Do you wish to allow this site to track your movements?" With the specific mechanism hidden thus, such concerns might be assuaged.
> This gets particularly confusing
> if you have multiple versions of similar-looking URLs with very
> different access properties:
The only reasonable response here is to treat all URLs as they should be treated - as opaque identifiers. If context identifies these as location URIs, then the safest course is to assume the worst: that it can be used to track some target.
--Martin
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