Hi,

> created accounts (used by persons sitting next to me) logged on. The
> Firewall Log showed passed packets to a NintendoDS.net site (that refers
> to nintendo.com) and the hostname of the client was also NintendoDS.

fun! here in the UK, if you have a NintendoDS you are free to use many
of the public WiFi hotspots without paying - eg TheCloud, BTOpenZone etc

check on www.nintendowifi.com

> like the Nintendo thing bypassed the CaptivePortal login-page anyway.
> 
> Is this possible?

maybe - I might spend some time looking at this :-)

alan