I've done it using Hypermarquee (with Hyperspin and Event Dispatch System). CRT Emudriver 2.0 and Windows 7 x64 here.
What I'm doing is using the integrated graphics for the secondary monitor (a VGA one), so I leave the ATI card alone, only for the CRT monitor. I'm using some Asus motherboard with i3 CPU.
Another good thing, there is no flashing during resolution change in the second monitor.
I know Calamity says you can use \\DISPLAYx command for selecting monitors, but I've found selecting your CRT monitor as "primary" (\\DISPLAY1) in Windows, works OK.