You can move the displayed dates range using the scroll buttons, and clicking on any of the highlighted dates displays the name of the holiday occurrence(s) for that date.
Highlighted dates have a different meaning depending on the type of script line.
•In the case of the International script line, the highlighted dates correspond to dates on which there is a holiday for any of the a-e-i-o-u Holidays sets selected. Clicking on any of the highlighted dates brings up a hint window showing the date, and all the holidays that fall on this date.
•In the case of an Insert script line, the highlighted dates correspond to any of the dates when an insertion will occur, as defined in the specific dates, repeating dates, and variable dates properties of the same script line.
You cannot edit this property.