Thanks so much for the reply. Opening Form3 is not a problem. The code I am using is fired by the OnClick event of a button I have placed on EditForm.
I have done further testing with the OnUnload event of the form and the OnValidate event of the page for EditForm. Neither of these are being called when EditForm is closed by using aForm.close.
Is there is different syntax necessary to close a built-in form?