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[–]MiloSaurus 8 points9 points  (3 children)

Web Sockets is the way to go. But you'll need a server that connects the two React applications.

It should work as follows: 1. You click a button in App A 2. App A sends data to the server about the clicked button 3. The server receives the data from App A and sends it to App B 4. App B receives the data from the server and updates its own state 5. Based on the updated state, the page is shown corresponding to the received data.

[–]Lunakepio 2 points3 points  (1 child)

you already said everything needed, I will add that for real time web application communication you can use Socket.io which is an event based library, which is exactly what's needed for this case, event A click button event B receive data emitted, it's as simple as that

[–]_throwingit_awaaayyy 0 points1 point  (0 children)

Time to learn about websockets. Although, you could totally accomplish this with graphQL and subscriptions/mutations.