Hi Thomas,The OnArrival check-in app allows for multiple devices to be logged in under the same username. A lot of customers will repurpose one of their Cvent logins to be a more generic "onsite staff" login that allows for OnArrival check-in access across all devices onsite. You can reference the article below to learn more:https://support.cvent.com/apex/CommunityArticle?id=000031290&Lang=en_US&searchTerm=onsite%20staff
Please let me know if you have any questions.Thanks!Alli