Sony VGN-BX740 User Guide (Microsoft® Windows Vista™) User Manual page 92

Alternatively, you can disconnect the computer from the multi function bay docking station as follows:
1 Turn off the computer and the connected peripherals; and then disconnect all connected peripherals.
2 Slide the LOCK/UNLOCK switch on the multi function bay docking station to the UNLOCK position.
3 Click Start and Undock Computer.
4 Make sure that a message balloon appears and the IN USE indicator turns off, and then press the PUSH RELEASE
button.
5 Lift the computer away from the multi function bay docking station.
6 Close the multi function bay docking station connector cover on the bottom of the computer.
It is extremely important to close the multi function bay docking station connector cover after disconnecting your computer from the multi function
bay docking station. If the cover is left open, dust may get inside and damage the computer.
To disconnect the multi function bay docking station completely from AC power, unplug the AC adapter.
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Using Peripheral Devices