multi_context.json

{
    "contexts": {
        "gpii-default": {
            "name": "Default preferences",
            "preferences": {
                "http://registry.gpii.net/applications/com.microsoft.windows.highContrast": {
                    "HighContrastOn": {
                        "value": true
                    }
                },
                "http://registry.gpii.net/applications/com.microsoft.windows.magnifier": {
                    "Invert": true
                }
            }
        },
        "user-defined": {
            "name": "Some other name",
            "preferences": {
                "http://registry.gpii.net/applications/com.microsoft.windows.magnifier": {
                    "FollowMouse": 1,
                    "Magnification": 150,
                    "MagnificationMode": 3
                },
                "http://registry.gpii.net/common/invertColours": true
            }
        }
    }
}