Can this be done?

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.
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