I really love all the features in GameEx (videos, dat support, jukebox, etc). However, I've been banging my head against the wall trying to get NullDC to work, even with the various loaders floating around on the forums here. But tonight I made a relatively simple discovery. I apologize if it's obvious and been discussed before, but it's the only thing that worked for me, so I thought I'd share. The other threads I've found that mention this line in the NullDC config do so in conjunction with scripts or loaders, and still have problems with exiting. At least on my machine with this config, the exit routine also works perfectly. First, I'm using NullDC 1.6 and Daemon Tools 4.10. - Setup Daemon Tools to create a virtual drive, note the drive letter for the new drive, and turn all options off. - Open NullDC outside of GameEx and configure it the way you want -- making sure to configure the controls, enable fullscreen in NullPVR, and select the GDRom plugin and set it to the drive letter that Daemon Tools creates. - In the main NullDC file folder, there should be a file called nullDC.cfg. AFTER you've configured NullDC completely, open this file in Notepad and change the option Emulator.AutoStart=0 to Emulator.AutoStart=1 - Setup the emulator in GameEx to match this, editing your paths of course to match where you store your roms and emulators. [Emulator_] Enabled=True StartPageName=Sega Dreamcast TitleText=Sega Dreamcast StartPageLogo=Dreamcast RomFilter=*.b5t;*.bin;*.bwt;*.ccd;*.cdi;*.iso;*.mds;*.nrg;*.pdi RomsInFolders=False ROMPath=C:\Emulation\ROMS\Dreamcast SnapPath= TitlePath= BoxPath= CartPath= WorkingPath=C:\Emulation\nulldc_100b1_6 MapKeys=True WaitBeforeKeys= SendKeys= ReplaceDash=False ReplaceUnder=True Capitals=False RemoveBrackets=True ShowDesktop=False Debug=False MapFile= AlsoLaunch= Command=nullDC_100b1_6.exe OLDatZip= LaunchBefore=""C:\Program Files\DAEMON Tools\daemon.exe" -mount 0,"[RomPath]\[RomFile]"" LaunchAfter="C:\Program Files\DAEMON Tools\daemon.exe" -unmount 0 configFile=[Mapping On] Exit nullDC (Process Close) ExcludedFiles= CustomBackground= PlayMusic= PCGame= DATABASE= GamesIn7Zips=False ManualPath= PlayInScreenSaver=False ShowMostPlayed=False RandomMostPlayed=True CDCheck=False CDCheckFile= lastgame= DontShowInfo= PlaySelectionMusic= SelectionMusicFolder= Anyway, your mileage may vary, but this works perfectly for me.