Sony PCG-R505JL - Manual (Page 23)

Disconnecting the Docking Station
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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.
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.
Removing the Notebook from the Docking Station
✍
(Microsoft® Windows XP) If you switch user accounts using Fast User Switching, the
UNDOCK switch function on the docking station will be interrupted. Instead, follow the
instructions to disconnect the docking station from the Start menu.