[Rails] Server detects change in data

My fundamental lack understanding of Rails and the architecture of the
'Net wil be demonstrated by the following question:

The following is a contrived example:

Assume I have several users looking at (identical) screens. Say, there
is some slowly changing stock market data that they are all looking at.
The price of the stock changes, say, once every minute.

Assume that a Rails application detects a change to the price and wants
to push the change out to the users without the users needing to do
anything? How does one make that happen?
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