With inf addons, the inf tells windows what to do to install whatever software you're integrating - with switchless installers you have to put it in a batch file (or something similar). I never could figure out how to concequently make switchless installers, but I'm quite familiar with the inf file structure now, so I just use that. Also 'true' addon packs, that is inf + cab ones, are thought to be cleaner. I'm not sure why, except that I think switchless installers sometimes create temporary files in obscure folders that they don't delete afterwards. On the other hand, switchless installers tend to be smaller than inf addons because cab compression isn't all that great. By the way, I think inf coders are generally at guru level in that they could integrate their packs without nLite's or Siginet's Integrator's help without too much trouble; me, though, I'm too lazy