Blocks third party cookies.
Enabling this setting prevents cookies from being set by web page elements that are not from the domain that is in the browser's address bar.
Disabling this setting allows cookies to be set by web page elements that are not from the domain that is in the browser's address bar and prevents users from changing this setting.
If this policy is left unset, third party cookies will be enabled but the user will be able to change that.
|Registry Hive||HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER|