This would serve to cases RPG forums. Here's an example:
A forum with a roll of Anime, where there is a post that only post those that have a character. Then he put password to post and gives to members who are entering the roll.
The talks are good, but my suggestion would serve to make something similar but that a post in the forum.
It is something that is used in various Spanish forums. And in view would be more public but can only enter with the password.
PS: I hope you understand my English.