Tree view control is designed to display data that is hierarchical in nature, such as organization trees, the entries in an index, the files, directories on a disk. It is often used in conjuction with the List view control, which is used to display the contents of the folder selected in the tree view.
List view control displays data as listitem objects. The control excels at representing subsets of data or discrete objects.The list view property is often used in association with a tree view control.
RDO is Hierarchy model where as ADO is Object model. ADO can access data from both flat files as well as the data bases. I.e., It is encapsulation of DAO, RDO , OLE that is why we call it as OLE-DB Technology.
User defined functions can be created into the Microsoft spreadsheet. Spreadsheets can be customized according to the user needs by using VB applications. To create visual basic functions useful for spreadsheet you need to click Tools and select Macros where you will need to click on Visual basic editor.