The Annunciator management instrument has a current mode that indicates whether announcements are added and removed automatically by the HPI implementation, by the HPI User, or both. The mode may be set to one of three values, with the following meanings: auto(1) - the HPI implementation automatically adds and deletes announcements; the HPI User is not permitted to add or delete announcements. user(2) - the HPI User may add and delete announcements; the HPI implementation will not automatically add or delete announcements. shared(3) - the HPI implementation automatically adds and deletes announcements and the HPI User may also add and delete announcements. The initial mode of each Annunciator is implementation-specific. The HPI User may change the mode of Annunciators with the hpiAnnunciatorMode object. However, the mode may be configured to be Read-only, in which case the HPI User will not be able to change the mode. When the mode is user(2) or shared(3), HPI Users may add or delete any types of announcements in the Annunciator's current set - not just HPI User announcements. This is allowed so that the HPI User can exert complete control over what conditions are being announced, if that is required. Note that this is less restrictive than the similar operations on the DAT. To distinguish between announcements added to an Annunciator automatically and those added by an HPI User, an hpiAddedByUser IdrField in the announcement indicates the source of the announcement in the set. Note: Enumerated values are increased by one value compared to SAI-HPI-B spec.