One of the fantastic new features of the Visual Studio 2005 (and later) IDE is the ability to use Visualizers. These are utility windows that attach themselves to various object types within the Visual Studio environment. When you hover the mouse over a variable of one of the supported object types, a magnifying glass icon appears within the popup tooltip, and clicking it opens the Visualizer window for that particular variable, allowing the variable content to be viewed much more easily. Several Visualizers are included with Visual Studio by default, to allow text to be viewed (as plain text, HTML or XML) and to allow DataTables to be examined more closely. The IDE allows further Visualizers to be written, however, such as ADCollectionsVisualizer.