Hi!

Yes.
You can scan a forms collection of the _screen object:

procedure CheckIfFormOpened
lparameters pcFormName
for i = 1 to _Screen.FormCount
  if _Screen.Forms(i).Name = m.pcFormName
    * form is opened
    return .T.
  endif
endfor
return .F.

The sample function above does check of form with name passed as a parameter opened or exists in the memory. If yes, it returns .T., otherwise - .F. In the menu you have to use this custom function call as expression for "SKIP FOR" condition for each menu item that runs such form.
Each time menu is refreshed, this function will be called and returning result o fthis function will cause enabling or disabling menu item.

HTH.

>Dear Vlad,
>
>In a Top Level Form with a menu to trigger the other forms worked on the Top Level Form. Is there any parameters, to check whether these form is exist on the Top Level Form or not?
>and, Can I disable some entries on the Pad Name/Popup Menu on the Top Level Menu, if the associated form is exist on the Top Level Form??
>
>
>
>With regards,
>
>Ransome