The presenter can enable multi-user whiteboard, which enables all users to write on the whiteboard at the same time.
When multi-user whiteboard is enabled, the whiteboard controls will appear in the presentation area.
The whiteboard controls are
- Drawing tools 
- Shape, Pencil and Text tools 
- Colour selector 
- Undo last annotation 
- Clear all annotations 
Selecting Drawing tools  will display a sub-menu of available drawing tools.
The available drawing tools are
- Text input 
- Line 
- Ellipse 
- Triangle 
- Rectangle 
- Pencil 
- Pointer 
To write on the presentation, select the Text Input  tool and draw a rectangle. The rectangle will be the text area.
To draw on the presentation, select the Pencil  tool. Select and drag the mouse button to draw a line. When the pencil tool is selected, you can use the other whiteboard controls to change the thickness and color of the line.