- Copy Finder.app from /System/Library/CoreServices/ to your user's Applications directory (/Users/user_name/Applications; you may have to create this folder if it does not exist). Do not copy the Classic application also named Finder; the one you want is around 5mb in size.
- Rename the file with a different name (say rootfinder) and change the icon.
- In the terminal, execute the application by typing:
sudo /Users/user_name/Applications/rootfinder.app/Contents/MacOS/Finder &
Enter your password when prompted, and replace user_name with your user's short username. "Open -a rootfinder" from terminal doesn't start the Finder as root, and so it won't bring up two desktops.
If you have ASM, you can switch between the two Finders and you will find the desktop picture and Finder preferences changes when you switch. You cannot switch using the dock as rootfinder does not appear in the dock. The only way to get rid of the root finder is to force quit.
[Editor's notes: As cautioned earlier, be careful when using a root Finder. You can do all sorts of bad things to your system with this trick! I experimented with this a fair bit, and had some mixed results. I was able to launch the root Finder with the simpler "sudo open -a ~/Applications/rootFinder.app", but this gave me a different desktop picture than did the above method -- yet both images were different than my standard user's desktop! Also, if you have DragThing you can switch between the two Finders and quit either one of them via the Process Dock. My desktop picture would NOT switch when switching back and forth between environments. Lastly, please be careful if you're going to try this hint! This is clearly a hint that falls in the 'experimental' category!]

