How to diable whole forum for guests but allowing them to view only Threads

[warezgen.com]

hi,

i want to make my whole forum such that when people come online they see login page but if they know the url of a certain post then they can view it but when they go back to forumdisplay page they once again see login page.

i hope you understand what i am talking about.

[Speysider]

This is a bad choice.
Simply because you will get lots of 0 posters registering to just see your forum.
Not a good tactic imo.

and such a method would be impossible to know for a new user.