Lumens Technology SMART Board(MAC) - Manual (Page 5)

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4.1.3 With SMART Board Notebook, press [View] / [Transparent Background] to go to
Transparent Background Mode. Or you can select the [Transparent Background] Icon on
the tool bar
4.1.4 If desired, use the annotation tools of [SMART Board Notebook].
4.1.5 Then, you could use [Screen Capture] tool of [SMART Board Notebook].