I m arranging a meeting with 20-30 experts and I want to make a database where I can add all of them and then I want to print badges with a qr bar-code on them for each of them and then I want to update their movements (check-in/check-out) by scanning their qr code on the badges, Is that possible to do that with access and how to update the database online ?

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Reply from Alex Hedley:

Yes, Expert 24 shows you how to use SQL Server to put your data online.
Scanning via QR is just another way of adding keyboard entry