Panasonic TH-65EZ1000U Ehelp page 226

Note
This function may not work properly depending on the signal format.
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Not valid in Analogue TV
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Data services are not available in multi window.
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You cannot change the aspect ratio in multi window.
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External input mode can only be displayed either on the main screen or
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sub screen.
HDMI is available for the main screen.
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Some signals are reformatted for suitable viewing on your display.
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Playback in fast-forward or in reverse on the sub screen may affect the
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picture quality on the main screen.
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