Sony PCG-505F - Manual (Page 85)

Customizing Your Notebook Computer %!
.
9
Click OK.
Display modes Functions
Monitor Displays only an external display connected to the
Monitor connector on the port replicator.
LCD Panel Displays only the Liquid Crystal Display (LCD) on
your computer.
Monitor/LCD Displays simultaneously both the LCD and an external
display connected to the Monitor connector on the port
replicator.
✍
You can adjust the refresh rate when you select Monitor as the display mode.
Some displays do not support using both the computer’s LCD and an external display
simultaneously.
To use the Monitor and Monitor/LCD display modes, an external display must be connected
to the monitor connector on the port replicator.