Some tools only work on the server version of Mac OS X.
In order to make these tools work on a client you can make the system think it is a server by issuing the following command:
sudo touch /System/Library/CoreServices/ServerVersion.plist
You may then use these server tools.
Afterwards you will have to change things back:
sudo rm /System/Library/CoreServices/ServerVersion.plist
Make sure to not leave out the last line, else your computer will think its Mac OS X Server!