It's a graphical portrayal of an e-prescription scenario, as enabled by Liberty Alliance Id-WSF. Before Dr Jones can write Adam a prescription, she needs to access his records and determine if there are any contra-indicated drugs.
In this scenario, HealthVault would be merely one of many health record providers.
We could update this to reflect advanced client functionality (e.g. blood pressure data securely shared from an identity enabled cuff) and social (e.g. spouses able to renew prescriptions for each other?) aspects.