Targus ACP60EU User Manual page 6

Targus ExpressCard Notebook Docking Station with Digital Video and Audio
About the ExpressCard Connector Card
The ExpressCard dock comes with a cable, a spacer (see "Using the
Spacer Connector" for additional instructions) and 34mm card to
connect to an ExpressCard slot in your notebook. The cable is
removable from the card. The card can be left in your system when not
in use.
The 34mm card has a small switch located in the circular area in the
drawing below.
When connecting the cable to the ExpressCard, Please make sure the cable tip is
properly and completely inserted into the cable port on the ExpressCard. Make
sure the tip is connected in the correct direction and do not force the connection
or it might break the device.
On-Pre-boot support
Off-Post-boot support (Default)
This switch is used to determine how the dock is recognized in the
system at boot up stage. Certain notebooks will detect the dock and not
work properly during a pre-boot mode (ie. trying to boot up on the
external VGA device, not the internal VGA of the Notebook). This was
observed in notebooks (Fujitsu, some Sony and Toshiba models) that
use a BIOS developed by Phoenix Technologies. If you experience
such issue, please turn the switch from the default "OFF" position to
"ON". You will only need to set it once.
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