Can I access my account from more than one computer at the same time?
StockCharts Support January 29, 2009
Yes, unless you are a real-time member (ExtraRT or PRO subscriber). The stock exchanges require that we prevent real-time members from using the same account from two different computers. During market hours, real-time members need to wait at least 15 minutes before accessing their account from a different computer.
Non-real-time members do not have that restriction.