You might want to look into the vnc client (either in normal mode, or in listen mode). UltraVNC provides a 'single click' configuration, that makes it perfect for a support based environment. In my department, I have a 'Uvnc single click' exe on the website. All the customer does is downloads the small exe, and runs it, and it connects to my vnc client (tablet or otherwise).

http://www.uvnc.com/addons/singleclick.html

edit: looks like I was mistaken. I can't seem to find the command line switch to put the vncviewer into listen mode. (vncviewer - listen doesn't appear to work)