PFCSIG pfcsig: Get Calling Window

[Haq, Imran]

Hi,
Query for you. I have a window. From it I open another popup window. Is
there anyway that I can 
find the name of the calling from the called popop window ( I need some sort
of pointer or handle to enable me to call functions
on the calling window).
Hope you can help,
Thanks,
Imran
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