Javascript communication between browser tabs/windows [duplicate]

Answer 1

This is an old answer, I suggest to use modern version described here:

Javascript; communication between tabs/windows with same origin

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You can communicate between browser windows (and tabs too) using cookies.

Here is an example of sender and receiver:

sender.html

Sender

Type into the text box below and watch the text 
   appear automatically in the receiver.

receiver.html:

Receiver

Watch the text appear in the text box below as you type it in the sender.