Return true if the argument is not a number.
Use window.opener to refer to the main window from pop-ups.
GET: Parameters are passed in the query string. Maximum amount of data that can be sent via the GET method is limited to about 2kb.
POST: Parameters are passed in the request body. There is no limit to the amount of data that can be transferred using POST. However, there are limits on the maximum amount of data that can be transferred in one name/value pair.
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