[TYPO3-dev] FE user logout - where?

[Pero Matic]

"Martin Kutschker" <masi-no at spam-typo3.org> wrote in message 
news:mailman.1.1261397365.1310.typo3-dev at lists.typo3.org...
> Pero Matic schrieb:
>>
>> Ok, i found it, there is a function logoff in class.t3lib_userauth.php 
>> but
>> something is strange. This function is called on every page??
>
> Every page accepts login and logoff form actions.

I don't get it. Shouldn't this be called only when logout form is submitted?