Distinguishing between two instances of the same portlet

Hi Experts,
Is there a way to distinguish between two instance of the same portlet in different browser windows?
I'm looking for something like URL parameter passing, but just for portlets.
The problem is, I want a way to pass a parameter between views in a portlet, but in such a way that if another browser window is opened and navigated to that portlet page, the parameter won't be the same. Perhaps I can explain better with this example:
Page A has a portlet on it which has a textbox and 2 buttons - the first button stores the value in the textbox in the PortletRequest (or PortletURL) and if you click the second button the portlet navigates to a different view which displays the value. If I navigate with a second browser window to Page A, however, and only click the navigate button, that value which was stored by the first instance of the portlet will still be shown. I want them to be independent, I don't want changes in the one's PortletRequest to reflect in the other one's PortletRequest.
Any ideas?
Thanks,
JP

Why not use two instances of the same portlet, i.e. create two channels of the same portlet.
The behave the same, have the same application logic, so all you need is to transfer informations between the two portlets.If you want this within user space use the portlet session, otherwise access the http session context /application context and store the data there.
The behavior would be controlled by the portlet preferences, so channel a (instance 1) would be configured to run as controller and channel b (instance 2) would be configured as receiver.

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    The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
    Please take this step regardless of the results of Step 1.
    Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
    Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
    Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
    The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
    Test while in safe mode. Same problem?
    After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.

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    adomi wrote:
    Hello,
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