If you double-click this key, you will be able to change the value of the DWord associated with it. There are three possible values you can use:
- 0 = Do not prompt. Setting this value to zero effectively disables UAC and allows programs and tasks to execute without first requiring consent to elevate privileges
- 1 = Prompt for credentials. When this key is set to '1', UAC will prompt for user credentials- a username and password- rather than simply asking for consent. This is a higher level of security than the standard UAC consent because it requires entering a password for a valid, authorized account each time.
- 2 = Prompt for consent. This is the default setting. When UAC is set to prompt for consent, any action or execution that requires elevated administrative privileges will result in the darkened screen and UAC pop-up to verify consent before proceeding.
For further explanation about the other UAC Registry keys, you can refer to the MSDN UAC blog, or Disable UAC on Windows Vista Home and Windows Vista Home Premium at TweakVista.