How to avoid one session in multiple browser instances

[Torsten Trzeciak <tr...@directbox.com>]

Hi,
in my app there is a very common way to handle data:
List -> Select a row -> change -> save

The ID of the data is in the session. What can I do to prevent multiple browser instances (e.g. CTRL N) . 
How can I guarantee that only one instance of the browser is open. Do they  send an ID or so?

I think one solution is to put the ID in a hidden field and compare it with the value of the session.

What is the best pattern to handle this problem?
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