Using a variable value from when page was generated

I have an application that can popup in separate windows multiple instances of the same Apex page. At the time of generation of the first instance, P1_key is 100. The user then opens a second instance of the same apex page with the current value of P1_key equal to say 200. If the user submits the first instance of the page, I want to use the previous value of P1_key, 100, to update that row in the database. The application wants to use the current value of P1_key, which is 200. So the user thinks he's updating record 100, but, in effect, is updating record 200. How do I get Apex to recognize the value of a variable at the time the page instance was generated, even though the current value of the variable may have changed due to a second (or third) instance of the page having been opened?

Could I open the page in its own session possibly, in order to prevent Apex State management from always utilizing the "current" value?

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Using a variable value from when page was generated

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