hmmmm. Not that safe...
My partner works as a health visitor for the NHS and I for one have been able to wonder into her office, wave at the staff on the counter (they're thinking ... it's only him - XXXX's friend) , make a coffee and log in with her details already.
(This was only because we did not then have broadband at home and I wanted to download a new gentoo release).
There are layers of protection for their Novel network but usually you'll find that the user once "in" has saved their passwords. Or in my partners case - has them on post-it notes stuck to the bottom of the mouse mat.
I've done my fair bit of network intrusion in a past life and know for a fact I'd be able to get into this system with nothing but a smile and a wave.