VirtualBox Main API

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- object : IPerformanceMetric
- objectSize : IFsObjInfo
- objInfo : IGuestDirectoryReadEvent
- offset : IFile, IGuestFileIOEvent
- online : ISnapshot
- openAction : IFile
- operatingSystem : IHost
- operation : IProgress
- operationCount : IProgress
- operationDescription : IProgress
- operationPercent : IProgress
- operationWeight : IProgress
- options : IRecordingScreenSettings
- order : IUpdateAgent
- origin : IGuestScreenInfo
- originX : IGuestMonitorChangedEvent, IGuestScreenInfo
- originY : IGuestMonitorChangedEvent, IGuestScreenInfo
- OSName : IMachineDebugger
- OSTypeId : ICloudMachine, IGuest, IMachine
- OSVersion : IHost, IMachineDebugger
- output : IGuestMonitorInfoChangedEvent
- overlay : IFramebuffer
- owner : IGuestDirectoryReadEvent