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In Slide Show view, move the mouse to display slide show buttons.
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Click the Pen button,
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click or point to an option:
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A writing tool (Ballpoint Pen, Felt Tip Pen, or Highlighter),
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An Ink Color to select an ink color.
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Drag the mouse pointer to draw on your slide presentation with the highlighter.
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Click the Pen button,
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click Eraser to remove individual ink.
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Click Erase All Ink On Slide when necessary.