Sap WAS 6.20 or 6.40

Hi,

I am reading TBIT40, one text paragraph with external systems that a direct system connection using proxies and without additional adapters is supported for SAP systems that are based on SAP Web Application Server 6.20 or higher, but in a graph, it indicate 6.40, so I am just wondering:

1. It is 6.20 or 6.40 no need adapters?

2. If it is 6.20 or higher, which means if the system just 6.20, then it won't need adapter?

Thanks for your input.