Beta access trick needed

I have passwords and logins for two beta groups on
I have tried Netscape and Opera to access both groups, however it seems
I must completely remove the server (and it’s history) in order to
access the other group. In other words, it seems I can log in only when
setting up a server from scratch.

Needless to say, this is a real pain. Anyone have a reasonable way to
manage more than one beta login, preferrably with Netscape.