The left was the power, the PRIMARY USB, and the headphone jack.

The right sported a MINI DisplayPort and another USB. Someone says that you can connect a EXTERNAL GRAPHICS CARD!!!

The two different USB port use two very different driver. PRIMARY one is a USB 2.0 with PowerShare, the SECONDARY ONE was a USB 3.0 without Powershare and requires external drivers (Fresco Logic, yes.)

Did you notice the holes and the small button on the right?

It let you check how much battery there are. One light means 20%. Surely one of the rarer design, but clearly DELL kept the line up since ... their Studio XPS?