Figure 5-15 A pop-down information bar to passively notify the user
of an event
297 Putting CardSpace to Work
It is quite clear that the use of Information Cards is enhanced signi?¬?cantly when
a user is presented with effective, yet passive, noti?¬?cations. Web developers
would be wise to adopt one of these methods or create other ones that achieve
the same goals and ?¬?t with their website aesthetics.
Figure 5-16 A pop-up information bar to passively notify the user of
an event
Account Maintenance
Some roaming users will opt not to move their cards from one
computer to another. If the website implements a many-to-one
card association with accounts, users should be able to simply
add or remove cards from their account. The dif?¬?culty with this
is that a user can potentially create two cards with exactly the
same claims, but not the same PPID and keypair. Unfortunately,
there are limited ways to tell the cards apart at this point. The
only empirical data available to the website is to use the sitespeci
?¬?c ID and list the cards the user has associated with the
website (see Figure 5-17). This may optionally be coupled by
showing the last sign-in time of that particular card.
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