Direct access to views

[eluser]luukskywalker[/eluser]
I have a small question regarding views.

I am working on a login system for a new web application.
When users log in and validated their username and password, the variable logged_in in the session changes to true.

My question is:
Is it possible to access views via url's?

If not, then i can just check the loggin boolean at the beginning of the functions after users logged in.