If Object is a Form, the complement string for the current form is returned. If the Object is a Field, the field complement string for the current field is returned.
Object.ComplementString
Object.ComplementString [= Value]
String. This string can store up to 2,147,483,647 characters.
In the case of a form complement, the string is the same as the #Complement variable used in a transaction description.
Form: GetComplStr, SetComplStr
Field: GetComplStr, SetComplStr