I am trying to find a way to make a sort of "admin panel" for my website, (e.g. press button on Webpage 1 and then have something happen on all the open instances of Webpage 2, without refreshing)

The webpages I want to send from and receive from are on the same server. First thought that came to my head was MQTT, but i'm not sure that it is the right tool for the job.

Trying to do this all in Javascript.

Thanks.