Dell Latitude C840 - Manual (Page 10)

Docking Connector
Parallel Connector
Serial Connector
USB Connectors
Bottom View
NOTE: Docking devices may not be available in all countries.
Connects the optional docking device. A docking device allows you to easily use external devices with your computer, such as an
external keyboard, mouse, and monitor.
For information on your computer's power requirements for docking, see " Docking Power Considerations ."
See the documentation that came with your docking device for additional information.
Connects a parallel device, such as a printer.
Connects serial devices, such as a mouse or handheld device.
Connect USB devices, such as a mouse, keyboard, or printer.