I think Avbrief have modified their user authentication.
I've been using their little
PDA URL for a couple of years. This never asked for a login, but now it does.
However, while it asks for it every time on my desktop PC, it doesn't ask for it on my HP4700 PDA.
I am a paying subscriber, so on the desktop PC the login/password are already preconfigured and I just press OK. I am pretty sure I had previously entered the login/pwd into the PDA too, at some stage.
Interesting to note that the same login/pwd pair that gets you into the main site also works on the PDA login.
This suggests that they are now using cookies, or using them in a different way, but TBH I don't know enough about this stuff.
On my desktop, I enable 1st party cookies, block 3rd party cookies, and enable session cookies. On the PDA, the behaviour is whatever the default is; there is just one box called "allow cookies" and that is checked.