NEC NP3150 User Manual page 104

Selecting Cornerstone mode [CORNERSTONE]
This option allows you to correct trapezoidal distortion.
Selecting this item will display the Cornerstone adjustment screen. (→ page 40)
NOTE: When [KEYSTONE] is selected, [CORNERSTONE] is not available.
Using the pIp Function
This function allows you to view two different signals simultaneously.
PIP POSITION:
This option allows you to select the position of a sub picture in the main picture.
The options are: top-left, top-right, bottom-left, and bottom-right. (→ page 43)
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6. Using On-Screen Menu