Cookie management

[eluser]John Murowaniecki[/eluser]
[quote author="InsiteFX" date="1332517852"]..If you want to restrict the cookie to a single host, supply the domain parameter as an empty string.[/quote]

..Dude, I didn't understand: if I have only one application on my domain and set the $config['domain_name'] to my domain isn't the same that set to an empty string? Both made a cookie with the correct domain.

..But I'm not sure about those configurations - and I need to read more about good pratices with cookies and security ('cos I think this isn't a secure way).