Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

{ 
  Call GetSystemMetrics() with the Flag SM_REMOTECONTROL to determine 
  if the current session is remotely controlled. 
  Its value is TRUE if the current session is remotely controlled; 
  FALSE otherwise. 
}

 function IsRemotelyControlled: Boolean;
 const
   SM_REMOTECONTROL = $2001; // from WinUser.h 
begin
   Result := Boolean(GetSystemMetrics(SM_REMOTECONTROL));
 end;

 procedure TForm1.Button1Click(Sender: TObject);
 begin
   if IsRemotelyControlled then
     ShowMessage('Remotely controlled.')
   else
     ShowMessage('Not Remotely controlled.')
 end;