Sony VAIO VAIO Notebook Computer User Manual page 44

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1 Pull out the two release levers on either side of the rear corners of the
docking station, to release the notebook from the docking station.
Releasing the Notebook from the Docking Station
2 Remove the notebook from the docking station, while moving the notebook
slightly back to disengage it from the two front latches of the docking
station.
Removing the Notebook from the Docking Station
Disconnecting the docking station when the notebook is on
You can use the Start Menu in the Windows task tray or the UNDOCK switch on
the docking station to disconnect your notebook from the docking station while
the notebook is on.
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Pull release levers on either side of
rear corners of docking station