3.5.4.5.2.2 IsInstalledResponse

 <xsd:element name="IsInstalledResponse">
      <xsd:complexType>
        <xsd:sequence>
          <xsd:element minOccurs="1" maxOccurs="1" name="pfIsInstalled" type="xsd:boolean"/>
        </xsd:sequence>
      </xsd:complexType>
    </xsd:element>

pfIsInstalled: Contains "true" if disk protection is installed on the server; otherwise "false".