There is a terminal command for just about everything, one of the things you discover about Mac OS X as you get to know it is that many, many parts of the system are customizable .
If you’ve ever been frustrated by not being able to close the Finder , there’s a trick to enabling the option to close the default Mac OS X browser . What can this do? For example, to use a Finder replacement by default. Another reason to want to have it closed is to gain a few extra processor cycles and a few more megs of RAM when we are stressing our computer resources.
So open your terminals (it doesn’t bite, I promise) and type in:
defaults write com.apple.Finder QuitMenuItem 1
We will need to restart for the changes to take effect. And to get back to normal behaviour you can type a 0 instead of a 1 in the previous command and you’ll get the default behaviour again.
Be careful when enabling this trick because Finder controls the display of your desktop icons and if you close it you will see it clean and you won’t be able to access what you had there (disks, aliases, whatever), to reactivate Finder you just have to click on it in the Dock icon.