allow external.php to export hidden forums as RSS

[uberjon]

an alliance i run the forum for. requires exporting of hidden content (hidden to guests and non clan members) to our sub clan's forums where they are imported to hidden areas.

i can use (already typed up) an IP deny system in PHP to only allow our clan's static server IP's to access the external.php file properly.

what i am looking for is either a hook mod. or a hard coded mod to make external.php offer content for forum ID X to be exported. "even though its hidden to guests" however i would only like it to apply to "forum ID X" not every forum section on our main boards.

if this is at all possible. in any way shape/form please help here or via PM