WindowHeight Property [Access 2003 VBA Language Reference]
Returns or sets the height of a form, report, or data access page in twips, depending on the object. Read-only Integer for the Form and Report objects; read-only Long for the DataAccessPage object.
expression Required. An expression that returns one of the objects in the Applies To list.
The WindowHeight property is measured from the upper-left corner of the form, report, or data access page to its lower-left corner.
The following example displays a message box indicating the height of the window (in twips) for the "Switchboard" form.