I'm actually curious about this myself since I've been playing around with making an unattended windows copy with apps using nlite. The thing is nlite makes an iso image file, which isn't what I want, so instead, I copy the contents, including silently installed apps, onto a dvd in a multisession using nero. The thing is I get the same error in using this method vs. having nlite make an iso for me. Is there a way to go about keeping a session open, since I don't want to be able to add more apps along the way if I need to change things on this dvd? Thanks.