@boboo: I am not quite sure what you are showing on your page - it is polish :-)
I am looking for a page in .cart or .cms where the user can write comments, all other can see these comments and are able to answer - like a blog. Important for this page is the function that the user has to enter a global username and password. I believe this can be done with .htaccess, BUT this means that this page has to be in a separate directory, or ? Or does .cart or .cms has a different way to secure this page only ?