Folder Type Custom Queries work like other Custom Queries, except they retrieve folders rather than documents.
When a Custom Query is used for folder retrieval, the Folders window is opened and displays all folders satisfying the search criteria. A folder may be listed multiple times if it has more than one value for a Keyword Type that is used as a display column.
The Folders window opened with the folder search results allows you to perform folder-related tasks, such as viewing folder Keyword Values or displaying Folder History.