As a number of readers have pointed out, supporting concurrent access to multiple cards would be another way to avoid requiring customers to swap cards in order to sign in using a different profile.
As much as I wish this approach could be pursued, I think it would be problematic.
Concurrent access is not common industry practice and (perhaps most troublesome of all) changes in the application software code may be required to concurrently access multiple cards from a given process. This is b/c such access would have to be segregated into different threads, and application software is currently single–threaded.
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