That's .htaccess work - redirect based on user-agentIf it's Google-bot, show the page, if not - redirect!
Thanks for the useful tool and information . Are there any review of it ?redirection is blackhat....that is why you are here, the best redirection product i have used is WP Cloaker does EVERYTHING you need to keep you as safe as is possible. The developer is on BHW his ID is qcp860 and is a really helpful guy.