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I want to say there were about 7 reps in Austin on iPads. I walked into the store at 11:15 and I was number 106 in line. The person asked me questions but entered all the data for me. Maybe took 2 minutes.
Big companies use VPNs to connect remote computers (and other devices) to public-looking websites. The link used at the stores today is simply behind a VPN; no matter how hard you try, you just won't get the link to work unless Tesla releases it publicly.
Every business gets hammered when they are not prepared for a higher than anticipated volume of customers. Either Tesla fully expected this volume or they were prepared for it either way. Seems they were exceptionally efficient in getting customers through and ordered. Kudos.