I'm using 3 monitors ... ProShow uses 2 of them (all 3 if I want it too). All I do is drag the Slide Options onto a different monitor than the program window is open on. ProShow does support multiple monitors already. If you look in the Preferences | Playback under Miscellaneous Playback Preferences, you'll see an option for Preview monitor. The dropdown will show default, 1, 2, 3, etc monitors. So, you chose which monitor you want your preview to show up on (when you do a full-screen preview). So, I can use monitor 1 for the main program window, monitor 2 for the slide options window, and monitor 3 for full-screen playback.
What's New: Tools for ProShow: v10.17f1
Access ProShow capabilities Photodex doesn't provide (For PSG & PSP).FPVP Blog "Making the Difficult Easier," FPVP News