$function = Win32::API->new(
      'mydll.dll', 'int sum_integers(int a, int b)',
  );
  #### Method 2: with parameter list
  $function = Win32::API->new(
      'mydll.dll', 'sum_integers', 'II', 'I',
  );

##</code><code>##

  $function = Win32::API->new(
      undef, 1900000000, 'int meaninglessName(int a, int b)',
  );
############ OR
#if dll name undef, func name is numeric pointer
  $function = Win32::API->new(
      undef, 'int 1900000000(int a, int b)',
  );