>I have hidden the main vfp window with a showwindow(handle,0).
>I show the only form when(using timer) time()=(the right time) by thisform.visible=.t. but it's not active.
>tried the showwindow(the handle,1) - not active
>and then with a 5(normal) -not active
> maybe activate window would work but not with the formname I tried.
>Thanks
>Ken Paulson

So, you want to activate form from timer, i.e. within application. It doesn't requre API calls. What you should is to instanciate this form accordingly OO rules:
DO Form1 Name oApp.Myform LINKED
Now you can always call this form from any place in your app:
***Timer.Timer event
oApp.Myform.Show