How to change my web browser's proxy setting only in an individual instance?

In my application, I opened a web browser(IE or Netscape). I want to change the browser's proxy setting to "localhost:7000". But I don't want to this change affect other browser instances. That is, I want the change become effective only in the window which opened by my app.

Can anybody help me?

Thanks.
chaimxAsked:
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jhanceCommented:
Sorry, neither IE nor Netscape work this way.

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chaimxAuthor Commented:
I have used Loadrunner for a period.
Loadrunner can do this.
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