First off, if there is a decent FAQ that explains specifically what I wish to learn, please point me to it. I'm a very analytical person and as such --coming from windows-- I'd like to know the specific differences in what actually happens when a program installs on mac vs windows. I realize that mac has no registry to hold user settings, etc. I assume mac programs just use per-user config files which are dynamically created similar to linux. Aside from that(and even that may be inaccurate), I know very little. I see when I download a .dmg file, it's mounted but where does there appear only to be a program file and little else? shouldn't there be many folders and files with pieces of the software? thanks in advance for the insight!