I need some time to experiment with this. I believe FoxPro will continue to "see" the hidden form because the hidden form is already included in the forms collection. The major question here is can we prevent FoxPro from seeing the hidden form at all, and exclude the form from the forms collection?

>>Another way is to remove the title bar of the form. You can remove the title bar setting the following properties of a form.
>>
>>1) Caption = "" (None)
>>2) ControlBox = .F.
>>3) MaxButton = .F.
>>4) MinButton = .F.
>>5) Movable = .F.
>
>Your idea works as well. However, as it is with the top level form, the Window menu will enable the Show All. Is there a way to avoid the menu to react to a form. In this case, there is no visible form, but the user can click on Show All. This will not make the form shown as I have ThisForm.Left=-1000. But, after the click, the menu reacts and enable the Hide All and disable Show All.