Windows CardSpace is the implementation of that agent on the
Windows platform. It enables Windows users to participate in
the Identity Metasystem, taking care of the nitty-gritty details of
RP and IP communications while presenting to the user an intuitive
fa?§ade. Some form of user agent is a necessity, imposed by
the human-integration requirements of the Identity Metasystem.
As long as the traf?¬?c generated abides to the open protocols we
have seen so far and the UI provides an experience compatible
with the identity laws, every platform has the freedom to come
up with its own (or even more than one) agent. Apple Macintosh
and Novell Linux are examples of non-Windows platform for
which a user agent is already available. Although there are no
guarantees that the experience will be replicated verbatim on
every selector and on every platform, thus far the card metaphor
is being consistently used across the various projects.
CardSpace is what allows Windows users to experience situations
like the wine seller example in an extremely natural fashion,
where having your age veri?¬?ed is as simple as clicking a
picture of your driving license on the screen. Where the user
experience is just natural gestures and the control that derives
from it, the system supplies all the intelligence necessary for
probing services for policies or calculating what it takes for obtaining
a token from a certain STS.
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