Open Online Registration is for everyone, but fair warning, in the past, badges have been known to sell out in 60 to 75 minutes. All badges are single-day passes, but if you purchase four, they will be combined into one four-day pass during on-site registration. Everyone who qualifies for registration will receive a personal Registration Code that can only be used on ONE digital device. Digital waiting rooms open one hour before the sale, but the system randomizes everyone.

Source: https://www.distractify.com/p/how-to-get-a-comic-con-pass