Is there a way to run an app (for example Gmail app) on a different device in the same wifi network? Conditions:

1. Two Android smartphones are in the same with network.
2. The devices are controlled by the same person.
3. The user runs the script/app on one device that starts Gmail app on the other device.
4. There is no Internet connection in the network. Just the connection between the devices via WiFi.

Is there a way to run an app (for example Gmail app) on a different device in the same wifi network? Conditions:

1. Two Android smartphones are in the same with network.
2. The devices are controlled by the same person.
3. The user runs the script/app on one device that starts Gmail app on the other device.
4. There is no Internet connection in the network. Just the connection between the devices via WiFi.
5. No root access to both devices.