This privilege determines if the user can create a symbolic link from the computer he is logged on to.
WARNING: This privilege should only be given to trusted users. Symbolic links can expose security vulnerabilities in applications that aren't designed to handle them.
This setting can be used in conjunction a symlink filesystem setting that can be manipulated with the command line utility to control the kinds of symlinks that are allowed on the machine. Type 'fsutil behavior set symlinkevalution /?' at the command line to get more information about fsutil and symbolic links.
Computer Configuration\Windows Settings\Local Policies\User Rights Assignment
At least Windows Vista, Windows Server 2008
User Rights security settings are not registry keys