This document might help.
Ok so I reviewed that PDF and it looks like it doesn't have anything specific to the 3020 or Tx0D.
It says that since it has two video ports, that it can't use the splitter. So like i described in my first post, I used a dvi-i to vga and that is working, but when I try to us the dvi-d to DP, it doesn't display anything to that monitor. Please help me with this issue. I have 16 units and none of them can do the dual display and i'm pretty upset since the reason why I bought these for my client is because they wanted that option and right now I can't do that with any combination of cables that i purchase. If it doesn't work I would like a refund on all 16 thin clients.
I haven't found a DVI to DP adapter that works reliably, and Dell does not sell one. You will have to talk to the tech support for the DVI to DP adapter for any requirements. The 3020 will work with Dual displays as long as you use a DVI and a VGA monitor.