LG 42PXSDC Owner's Manual page 44

PICTURECONTROL
TV Program Selection for PIP
Use the PIP CH +/- button to select a channel for the sub picture.
The selected channel number is displayed just below the input source of main picture.
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Swapping the PIP / Double Window
Repeatedly, use the SWAP button to switch the main and sub pictures.
Component, RGB, HDMI1/DVl, HDMI2 input sources for the main picture can't be used to swap the
main and sub pictures.
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