hey, is there any tutorial on how to build an app, that when the user clicks something, all the other users can see.
For example you have a list with 5 road names, when there is an accident on road 3, and an user clicks the road 3 button, all the other users can see, or are notified in some way.
Is there anyway of doing this? And if there is, how hard is it? I don't have much experience.