2.2.1 InstallationImpact
The InstallationImpact enumeration defines values that describe the level of impact resulting from installing or uninstalling an update.
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typedef enum tagInstallationImpact { iiNormal = 0, iiMinor = 1, iiRequiresExclusiveHandling = 2, } InstallationImpact;
iiNormal: Installing or uninstalling an update results in a level of impact on the target computer that is typical of most updates.
iiMinor: Installing or uninstalling an update results in an insignificant impact on the target computer. For example, this can apply to an update to the signatures of an antivirus application.
iiRequiresExclusiveHandling: Installing or uninstalling an update has such a high impact on the target computer that the update is required to be installed or uninstalled exclusively. This value can apply to a major update such as an operating system service pack.