Sony IPELA PCS-G70 Operating Instructions Manual page 156

To change the settings
Set "Monitors" in "Monitor Out" of the Video Setup menu to "2". Next, select
the connector where the second monitor is connected. To do so, set "Monitor"
in "Monitor Out" of the Video Setup menu to "SUB". Once the settings are
changed, the first monitor displays video, while the second displays still
images.
Note
The settings cannot be changed while transmission is in progress.
For details, see "To change the images displayed in a dual monitor setup" on
page 157.
To view the picture as a window picture
When you press the PinP button of the Remote Commander during
communication, the picture appears as a smaller window picture over the
display of the first monitor.
Note
You cannot perform this operation on the second monitor.
156
Using Multiple Monitors