Re. the VMS clustering: pardon my complete ignorance but how did orchestration work? How was the host of a new process chosen? Could processes be migrated from

Re. the VMS clustering: pardon my complete ignorance but how did orchestration work? How was the host of a new process chosen? Could processes be migrated from host to host? And how do you connect to a given service if you don't know where it's running? Any link to some overview of how this work would be greatly appreciated.