Dell XPS 18 (1810, Early 2013) - Manual (Page 36)

Dock Your Computer on the Powered Stand
1 Align the docking port on your computer to the docking
connector on the powered stand.
2 Place your computer onto the powered stand.
NOTE: The docking status light turns on when your computer is correctly
seated on the powered stand and the powered stand is properly
connected to a power source.
36 │ Powered Stand (optional)