<div class="content"><p>The InstallationImpact enumeration defines values that
describe the level of impact resulting from installing or uninstalling an
update.</p><dl>
<dd>
<div><pre> typedef  enum tagInstallationImpact
 {
   iiNormal = 0,
   iiMinor = 1,
   iiRequiresExclusiveHandling = 2,
 } InstallationImpact;
</pre></div>
</dd></dl><p><b>iiNormal:  </b>Installing or uninstalling an
update results in a level of impact on the target computer that is typical of
most updates.</p><p><b>iiMinor:  </b>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.</p><p><b>iiRequiresExclusiveHandling:  </b>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.</p></div>