If you enable this policy, the "Internet" "Search again" link will not be shown when the user performs a search in the Explorer ...

If you enable this policy, the "Internet" "Search again" link will not be shown when the user performs a search in the Explorer window.

If you disable this policy, there will be an "Internet" "Search again" link when the user performs a search in the Explorer window.  This button launches a search in the default browser with the search terms.

If you do not configure this policy (default), there will be an "Internet" link when the user performs a search in the Explorer window.