Yes, the Qflow check app runs and syncs with all other devices that are logged into the same event. This allows you to have multiple door staff using Qflow at each of your event entry points.
To maintain real time syncing between all devices, you need to be connected to a WiFi connection or via 3G/4G. If you are not connected to a WiFi or 3G/4G connection while admitting guests, the app will continue to work as normal storing all guest data locally on the device. As soon as you get back into a WiFi zone or regain a 3G/4G connection all your guest data will sync automatically.