bukan kah saat formcreate semua yg ada pada form (termasuk uses), akan diciptakan secara ostosmastis, begitu juga sebaliknya saat formdestroy / formclose

Btw : pertanyaannya kok aneh ya???

unit OtherForm
interface
uses
  ...,
  MainUnit;
type
  TOtherForm = class(TForm);
  ...
  end;
implementation
initialization
  MainUnit.RegisterFormClass(TOtherForm);
finalization
  MainUnit.UnregisterFormClass(TOtherForm);
end.

unit MainUnit;
interface
uses
  ...; // OtherForm ngga' perlu di add
type
  TFormClass = class of TForm; // typecast form class
  ...
implementation
// show TOtherForm
procedure MainForm.Button1Click(Sender: TObject);
begin
  ShowRegisteredForm('TOtherForm'); // gunakan nama class sebagai string; so no dependecies to OtherForm.pas
end;
procedure MainForm.ShowRegisteredForm(const AFormClassName: string);
var I: Integer;
      AForm: TForm;
begin
  for I:= 0 to FClassRegistry.Count - 1 do
    if SameText(TFormClass(FClassRegistry[I]).ClassName = AFormClassName) then
    begin
      AForm:= TFormClass(FClassRegistry[I]).Create(nil);
      AForm.ShowModal;
      Exit;
    end;
end;

bingung ya... sukurin hak.. hak.. hak..