I was blocked again my a customer firewall. When I get a moment this afternoon I'm going to install and try my friend Rob Daly's suggestion of using Hamachi. I'll use this as a "backdoor" so that I don't become stranded. However, I don't consider this a long term solution, nor is it a scalable solution for a company looking to roll this out.
I might also try VNC. The Wyse X90 has a VNC client installed by default. I just need to install the VNC server on my virtual desktop.