Tank Auth is_logged_in usage

[eluser]Unknown[/eluser]
I am trying to verify (in the absence of documentation), my understanding of $this->tank_auth->is_logged_in()

As I understand it, this method verifies whether 'somebody' is logged in, but cannot verify who it is.

I want to know if a particular user is now logged in.

Thus my code at a certain point looks like this:

Code:

if ($this->tank_auth->is_logged_in()
&&  $new_login_name == $this->tank_auth->get_username())

Do I need to bother with is_logged_in?
Is the second half of my && sufficient and safe?
Will a login always succeed, overriding a current login?

If there is doc I have failed to find, please point me to it. I support the concept of R-ing TFM when TFM exists :blank:

[eluser]haseydesign[/eluser]
I can't help you with Tank Auth, but if you want an auth library with a very good manual - then try mine.

http://haseydesign.com/flexi-auth/auth_lite/user_guide