It's not unfortunate to have a job, it's good to have a job
Unfortunately I am at work, and...
Jokes aside. Xcode is included with each and every OS X disk/Image. If you have SL DVD, then you could install the SL version from the disk.
com.apple.Boot.plist is also located (the original that OS X on Macs uses) in /Library/Preferences/SystemConfiguration.