M-Run debug mode allows debug script step by step on the remote devices. Make sure you have external devices connected and proceed to M-Run Debug tab. Here click "plus" to add device you wish to perform debug execution at. Select device and application - in case of successful connection to device you will see actual remote device screen preview and thumbnail on the left side. Also you can use you previously configured and saved M-Run connection - navigate to M-Run tab, load your saved connection configuration, wait till it loads and then when you proceed to 1Script - M-Run Debug tab you will see loaded devices configuration. To start debug steps select device you want to operate with and you will see notification "M-RUN DEBUG MODE" on the menu bar. Now you are able to perform debug actions on the remote device just like on the local device.