VirtualBox Main API

### - o -

- object : IPerformanceMetric
- objectSize : IFsObjInfo
- offset : IFile , IGuestFileIOEvent
- online : ISnapshot
- openAction : IFile
- operatingSystem : IHost
- operation : IProgress
- operationCount : IProgress
- operationDescription : IProgress
- operationPercent : IProgress
- operationWeight : IProgress
- origin : IGuestScreenInfo
- originX : IGuestMonitorChangedEvent , IGuestScreenInfo
- originY : IGuestMonitorChangedEvent , IGuestScreenInfo
- OSName : IMachineDebugger
- OSTypeId : IGuest , IMachine
- OSVersion : IHost , IMachineDebugger
- overlay : IFramebuffer