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wmctrl -- rename window title but need to select by hexadecimal window identifier

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I have two instances of a windowed program running. wmctrl -l shows them having identical "long names," though their hexadecimal window identities shown in the first column are different. Using "wmctrl -r "oldname" -N "newname" doesn't work because, well, two windows with identical names. Entering "wmctrl -r -i -N "newname" throws off "Cannot convert argument to number." I can use :SELECT: to manually select the window to change but I want this to run from command line. How can I tell wmctrl to use the hex identity? Thank you!

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