This was correct for a long time but in a patch not to recent changed it to allow for multiple clients of vanguard.Last time I checked, Vanguard did not allow for this. You might want to search around on the vanguard official forums and see if anything else has come of people requesting this feature; however, last time I checked there was no way to run more than one instance of VG on a computer at a time.
Really?Its best to have them both full screen and just alt tab between windows. Youll need a good sytem to do this.
I have also noticed that I get much better performance in windowed mode. I actually was experiencing crashes when playing VG and have had zero since I switched.Really?
I only use one client with VG; however, I've found that playing VG in windowed mode is MUCH better than full screen. It seems more stable as well as more efficient, etc (especially if you are doing other things with your computer other than just playing VG.)