3) Expect “queuing”: Zients and others have said there will be times, including this weekend, when more than 50,000 users try to access the site at any given time. If that happens, they have installed a “queuing system” so that users over that threshold will get an e-mail telling them to return to the site when fewer people are using it.

4) What are insurers saying?: CNN’s Chris Frates and others report there are real problems with the back end of the site. Imagine the front end is the part viewed by people trying to get insurance. The back end is the part that interacts with insurers trying to deliver it. That part of the site has not been entirely built yet.

5) How will the public know if things working as planned?: There will be anecdotal evidence for sure, but there won’t much data on grading the fix immediately following the deadline. Specifics remain closely guarded. But Zients says the administration will release updates on site metrics, monitored in real time, and user experience and success rates “as we go forward.” New enrollment figures are not expected for a couple of weeks. The enrollment period runs until March 31, and officials have said the target for the first year was 7 million people.