>A. How can i release a FORM from program ( not in FORM - THISFORM.RELEASE )
> program as below :-
> DO FORM MYFORM && the form is in WindowType = 0-Modeless
> *** how to close MYFORM

MyFOrm.Release() MyForm is just a variable thats a refernce to the MyForm object.

>B. And how can i know the MYFORM is open already ?

vartype(myform) = 'O' should work.