restrict external pages

[krike]

I created some external pages and I would like to restrict it so only registered users can see it, what files do I need to include (so in php with include function) and what code should I use for this?

hope I posted in the right section and really hopes someone could help me out.

--------------- Added [DATE]1219045792[/DATE] at [TIME]1219045792[/TIME] ---------------

ok nvm I found what I was searching for under my post in similar threads :P