You are using the common Oracle account as an Oracle employee. You share this account with other Oracle Employees. The various VMs indicate their various characteristics: one is an SSM (Silicon Secured Memory) specific VM, another is DAX Developer (with APIs and code examples), the third is with the DAX hands-on-labs presented during OOW and the last one is the latest updated rev of DAX APIs. We didn't kill previous VMs when the new one was created.
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