I think there should be a portal that if you log into one, you automatically log into all 3. Or at least select which one you want to log into. Maybe when you visit the root site (nintendoage.com, segaage.com, etc), and you're not logged into one of the sites, or any, you can choose the option to log into a specific one, or "log into all".
Makes it much easier IMO. Just my $0.02.
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Proud owner of post #1800 in Inner Circle HQ thread