User in frontend & protected elements

Hi there,

i know TL is managing members and users separatly, but is there a way to know in the frontend, if the user is connected to the backend ?
do you have some tips to spare? :)

thanks !

edit;

another question, i did a module. on this one i can choose to protect or not the content (like the content elements, or pages) i did that in my dca file, with the palette en sub palette, it works in BE. but in FE it's doesn"t change anything the protected element is still displayed even with a member not in a group.
did i miss something?

Of course,
if you write your extension and define an identifier that might be the email or username for example.

in fact i'd like to do that for anyone who's connected to BE, not only 1 email/user name.