[Rails] How to handle concurrently opened windows

In some situations I need to store contextinformation of the current
window.

The simplest solution is to store this information in the session.

But what happens, if the user opens the application concurrently in two
or more tabs? Worst case will be, that one window destroyes the context
of another.

A quite cumbersome method is, to store window specific information as
hidden fields inside the page. A more generic method would be very nice,
but that probably means to distinguish concurrent windows on the client.

How to identify a window on the client?

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