Greetings, I am a very long time PC user (IT specialist) who just got a spare mac at work, and I'm trying to play around with it. It's a PowerBook G4 with OS X.2 installed. It had a bunch of stuff already on it so I'm starting off by cleaning out old stuff and updating with new stuff. Coming from PC I'm a bit unsure about installation / uninstallation of software. Case in point, I downloaded a firefox dmg file and mounted it, but it never went through an install, just opened up... I copied the file that was found in the dmg mount to the applications directory and it seems to work, but I'm wondering what is supposed to happen with these dmg files. I've also been clearing out old programs by simply dragging to the trash can (assuming I can't find an uninstaller) is this all I need to do? Is there some other cleanup I can do for control panels and the like? I'm confused about this OS9 compatability software, so many utilities. Do I need all this stuff? I'm using Safari now and liking it well enough, but I'm curious to find more. Mostly I'll be just web browsing, using iTunes, and playing around, but any suggestions for learning activities would be eagerly welcomed. Thanks!