Purpose With HistoryUpdate you deactivate or activate  the history update, either for the whole screen or for a single field (e.g. a date field).
Example HistoryUpdate F[Posting date] "off"
Format HistoryUpdate "off" / "on"

HistoryUpdate F[field] "off" / "on"

Deactivates or activates the history update for the whole screen or for a single field.

Components GuiXT