Just like on a computer, the Undo, Redo, and Clear buttons are used to fix something that was accidentally deleted or cleared from the screen. For instance, if someone presses the Clear button, the annotations can be returned to the monitor by pressing the Undo button twice.
It is important to know that all the evidence monitors are linked into a single system. Pressing the Clear or Undo buttons will affect all parties, not just the monitor directly in front of a party.
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Other training videos: Highlighter tool | Rectangle tool and adjusting the line size | Zoom tool | Other parties | Capturing annotations
User's Guide: Courtroom Digital Evidence Presentation System User's Guide