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Hello and welcome Christopher!
- You will need to persist the content of the ListBox item in a file or database when the user closes ProcessBook (e.g. in the Display.BeforeClose event) and initialize the ListBox control when a user opens the display (e.g. in the Display.Open event).
- This sounds like a standard use case which doesn't require any coding. You could use a PI point of type Digital to store the status information. Within ProcessBook, you would use a Value symbol, assign the Tag and chose the position (Left, Right, Top, Bottom) to show the Timestamp.