Sony VGN-SZ200 - Manual (Page 80)

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Using Peripheral Devices
To disconnect your computer from the docking station
1 Press the UNDOCK button and wait until the IN USE indicator (2) turns off.
✍
If the IN USE indicator is unlit, you do not have to press the UNDOCK button.
Pressing the UNDOCK button while the computer is in a power saving mode returns the computer to Normal mode first, and then initiates the
disconnection process.