Do we need docker and ADABAS installed on the PC to access to ADABAS in IBM Z/OS Mainframe?
No, the Docker components are only needed for the free demonstration NaturalONE Community Edition. Note that the NaturalONE CE version cannot connect to a mainframe or Linux/Windows.
Connecting to a mainframe or Linux/Windows Adabas & Natural host requires the commercial licensed version of NaturalONE.