# Using the ECUViewer window The ECUViewer displays the identification data of a connected control unit while a measurement is active.
| How to open the ECUViewer:
Click Options > Start ECUViewer in the Recorder.
| How to exit the ECUViewer:
Click the OK button in the ECUViewer.
| The contents of the ECUViewer:
For the contents of the individual identification data of the different control units, please see the corresponding product descriptions.
| Further topics:
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