Hi all. I'm an IT savvy person who is new to Macs. My natural inclination is to never install any software that I dont intend to keep, on a windows machine. As most of you know, when you un-instal an app in Win, it isnt really gone. Sure the files may be gone, but often the directory structure is left behind, but worst of all is the bloated registry that remains. So, my question is this. What happens when you install an app on OSX? Is it purely a file transfer? or are the equivalent to DLLs changed and registry entries created? Is there a difference between the way that something like Firefox installs and MS Office 2008? If you uninstall an app, what is left behind? As an example, remember that the old windows 3.1 didnt have a registry. You could just copy the files and folders into a root folder, find the .exe file and run it. Don p.s. I've recently discovered VMWare Workstation for Windows. Its great because I can install trial apps to my hearts content on the vm. Then rather than uninstalling, I just delete the vm and use a virgin one.