I've been studying http://technet.microsoft.com/en-us/library/ff393699%28WS.10%29.aspx
Is there a combination of settings that will accomplish what I now do a different way?
I invoke mstsc.exe pointing to an RDP file and add the /span option.
This gets me a maximized window spanning both monitors. I click restore; this gets me a smaller window on monitor 1. I drag the borders such that the window occupies most of both monitors. There are scroll bars which I don't want.