This user right determines which users can attach a debugger to any process or to the kernel. Developers who are debugging their own applications do not need to be assigned this user right. Developers who are debugging new system components will need this user right to be able to do so. This user right provides complete access to sensitive and critical operating system components.
Assigning this user right can be a security risk. Only assign this user right to trusted users.
Computer Configuration\Windows Settings\Local Policies\User Rights Assignment
At least Windows XP SP2, Windows Server 2003
User Rights security settings are not registry keys