Dell Inspiron 4100 Manual page 16

A Tour of Your Computer: Dell Inspiron 4100
HINT: Docking devices may not be available in all countries.
PS/2 Connector
HINT: You can use the integrated keyboard and an external keyboard at the
same time. When you attach a keyboard or numeric keypad, the integrated
numeric keypad is automatically disabled.
USB Connector
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Use this connector to attach the optional docking device, also
called an advanced port replicator (APR). A docking device, or
APR, allows you to easily use external devices with your
computer, such as an external keyboard, mouse, or monitor.
See the documentation that came with your docking device for
additional information.
Use this connector to attach PS/2-compatible devices, such as a
mouse, keyboard, or external numeric keypad.
Shut down the computer before attaching or removing a PS/2-
compatible device. If the device does not work, install the
device drivers from the floppy disk or CD that came with the
device, and restart the computer.
On an external keyboard, the
the key on the computer's keyboard (if the External Hot
Key option is enabled in the system setup program).
key acts the same way as