ASK Variable
Example (mimics DEFAULT):
SET DateVar TO TODAY
ASK DateVar
DateVar
It is permissible to use ASK with variables (not just dialogs). If a variable has already been answered, using ASK Variable is a good way to force the variable to be asked again, allowing you to change or keep the current answer. Using ASK Variable will also force a variable set to "Ask only in dialog" to be asked.
The example is a mimic of DEFAULT. It presets DateVar to today's date then forces the variable to be asked. The user can either accept today's date or enter a new date. The chosen date value is then inserted into the document.