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Not enough information. Are you writing the child window directly from the parent or are you opening a child window and filling it with a request to the server? If the former, are you clearing out the contents of any string you have been using to accumulate messages prior to opening the window? If the latter, have you considered the effects of caching? You may wish to explore information regarding closing a document and then reopening it and writing to it.
At any rate, any time you close a window, it is gone. Persistance is outside, somewhere, in a string or a file that is being saved or cached.
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