I used to play Oregon Trail (among other things) on an Apple in middle school but that was the last time I have used one. I just bought my very first mac ever (mac mini G4 1.5 Ghz 64MB vram 1GB mem 100 GB hard drive AP/BT/Modem I think that covers it, lol) and I have a program installation OS X specific question. I have read that you can drag and drop in applications to install programs. Tried that out, worked great. My question is what to do with the dmg files...are those equivalent to exe files on Windows PCs? As in, When Tivo Desktop went to 2.1 and I didn't want it, I still had my 2.0 exe to install from for all eternity so I didn't have to be force upgraded. Would I want to keep dmgs in case of a software revision of a program that I still want to use an older version of or do I have that all wrong?