This policy setting allows you to manage whether applets are exposed to scripts within the zone. If you enable this policy setting scripts can access applets automatically without user intervention. If you select Prompt in the drop-down box users are queried to choose whether to allow scripts to access applets. If you disable this policy setting scripts are prevented from accessing applets. If you do not configure this policy setting scripts can access applets automatically without user intervention.
HKEY_LOCAL_MACHINE -> Software -> Policies -> Microsoft -> Windows -> CurrentVersion -> Internet Settings -> Lockdown_Zones -> 2 # 1402
Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page -> Locked-Down Trusted Sites Zone