3.9.4 Message Processing Events and Sequencing Rules

To retrieve an ICategoryCollection instance, the client MUST call one of the following methods:

  • ICategory::Children (opnum 10) (section 3.6.4.3)

  • IUpdate::Categories (opnum 12) (section 3.20.4.5)

  • ISearchResult::RootCategories (opnum 9) (section 3.14.4.2)

  • IUpdateHistoryEntry2::Categories (opnum 22) (section 3.32.5.1)