From Xojo Documentation
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| This item was deprecated in version 2020r2.
Please use System.DebugLog as a replacement.
Outputs information to the system log.
This information is displayed in the Messages pane of the Xojo IDE which is displayed by clicking the Messages icon at the bottom of the Xojo workspace window. When running on the iOS Simulator, it is also captured in the Simulator console log, which you can access from its Debug->System Log menu item.