[TYPO3-english] Check backend user login

[Martin Altmayer]

Hello,

is there a way to check in TypoScript whether a backend user is logged in?
I am aware of TSFE->beUserLogin, but this flag is only set when a user is
logged in, he has access to the current page and the page appears in one of
his pagemounts (see class.t3lib_tsfebeuserauth::
extPageReadAccess).

I want to display links to some BE User sections whenever a BE user is
logged in and on every page regardless of his access rights.

Thanks,
Martin Altmayer