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1. Create (see Creating Detection Tools) and configure the necessary detection tool or select an existing one in the object tree for one of the video cameras.
2. Click the  button and select other target cameras. If you add the second-level tool, then only those cameras that have the same tool at the first level will be listed. 
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   To quickly select multiple cameras, hold down the Shift key, select the first and last cameras the newly created detection tool should be applied to. Selecting any camera from highlighted ones will result in selecting them all. 
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3. Click Apply. You can see the number of target cameras in brackets.