Access variable from one form to another

[question]

Thanks for response

Actually, i would like to do the following:

Procedure TForm1.Person1(ID:Integer);<--- i want to use this value of ID in another Form
begin
//
end;


Procedure TForm2.Button1Click(Sender: TObject);
begin
//here i want to use the value of ID from TForm1
*how can i get the value of ID from Tform1 to here
end;

Thanks for your response