Tracking systems with Internet access is also a major problem in web sites like HealthCare.gov, because of the complexity of the backend integration.
The federal site is connected to the systems of federal agencies, state governments and insurance companies. Uninsured Americans in 36 states use the site to buy health insurance.
"The number of connections that they have to make, some via the Internet, some via private network connections, is probably, if we knew the full scope of it, pretty staggering," Cowperthwaite said.
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