The Inspirion Duo comes apart in the same way as almost every other PC in the world: take out 90 (not really) screws from the back, turn the computer over, take the keyboard out, take out some more screws, then remove the top panel.

A common trend in PCs which we would love to see in other devices: many of the screw-holes are labeled to assist in reassembly. This hole is for a M2.5x8 screw.

For those who want a lesson in screw callouts: These screws are Metric (M), with a major diameter of the external thread of 2.5mm, and a thread length of 8mm (2.5x8).