iTool Creation Routines
            ICONTOUR: Create an iTool containing contour data.
            IIMAGE: Create an iTool containing image data.
            IMAP: Display georeferenced data in an iTool.
        
            IPLOT: Create an iTool containing plot data.
            ISURFACE: Create an iTool containing surface data.
            IVECTOR: Create an iTool containing vector data.
            IVOLUME: Create an iTool containing volume data.
            iTool Procedural Routines
            ICONVERTCOORD: Convert between iTool coordinate systems.
            IDELETE: Delete an iTool.
            IDLITSYS_CREATETOOL: Create an instance of the specified iTool.
            IELLIPSE: Create an ellipse annotation in an existing iTool.
            IGETCURRENT: Retrieve the iTool identifier of the current tool.
            IGETDATA: Retrieve data from a specified iTools visualization.
            IGETID: Retrieve the full iTool object identifier string for a visualization item.
            IGETPROPERTY: Retrievs a property value from an iTools visualization.
            IOPEN: Open a file, reads the data, and adds  the data to IDL’s current scope.
            IPOLYGON: Create a polygon annotation in an existing iTool.
            IPOLYLINE: Create a line annotation in an existing iTool.
            IPUTDATA: Replace the data in a specified iTools visualization.
            IREGISTER: Register iTool object classes or other iTool functionality.
            IRESET: Reset the IDL iTools session.
            IRESOLVE: Resolve all IDL code  required for the iTools framework.
            IROTATE: Rotate an iTools visualization.
            ISAVE: Save the contents of the current iTool as an image file.
            ISCALE: Scale an iTools visualization.
            ISETCURRENT: Set the current iTool.
            ISETPROPERTY: Set a property on one or more iTools visualizations.
            ITEXT: Create a text annotation in an existing iTool.
            ITRANSLATE: Translate an iTools visualization.
            IZOOM: Change the zoom factor on an iTools visualization.
            REGISTER_CURSOR: Associates a given name with cursor information for use in iTools.
            iTool Framework Objects
            See iTool Framework Objects.