I’m sorry I don’t quite understand the question. Uhm, if you mean going inside the campus using your IDs, I don’t think it works that way. I think you still have to have a valid reason for entering the campus and sign up at the South Gate. I’m not really sure though. :)

If you were talking about welcome as ‘giving pleasure or satisfaction or received with pleasure or freely granted’ (http://www.google.com/url?q=http://wordnetweb.princeton.edu/perl/webwn%3Fs%3Dwelcome&sa=X&ei=kdAUTKzfH4zANbramOQL&ved=0CBoQpAMoAA&usg=AFQjCNH2H-RXj3NhKCOkJfJYs_Gcfx0WMA), of course you are! XD