How to get a data for custom submit process: Webform ID

Hello. The function i want whit that is this:
(1)
* Have a form to get a code from de users
* Get the code for loguin the user as especific role
(2)
* Get parameter from user
* Make a query on db bases in that parameters

Tanks

...

I find this: http://drupal.org/node/1291574
"Custom coding: Adding advanced validation or submit code" D6 version

/**
 * Implementation of hook_form_alter().
 */
function mywebform_extra_form_alter(&$form, &$form_state, $form_id) {
  // Add validation for a particular Webform node:
  if ($form_id == 'webform_client_form_44') {
    // Simply add the additional validate handler.
    $form['#validate'][] = 'mywebform_extra_validate_44';

    // Add the submit handler after the existing Webform submit handler,
    // but before the second Webform handler. Pop off the first one and add
    // ours second.
    $first = array_shift($form['#submit']);
    array_unshift($form['#submit'], $first, 'mywebform_extra_submit_44');
  }
}

/**
 * Validation handler for Webform ID #44.
 */
function mywebform_extra_validate_44($form, $form_state) {
  global $user;
  if (!isset($user->roles[4])) {
    form_set_error('', t('Your user role is not allowed to submit this Webform.'));
  }
}

/**
 * Submit handler for Webform ID #44.
 */
function mywebform_extra_submit_44($form, $form_state) {
  global $user;

  // Changes can be made to the Webform node settings by modifying this variable:
  $form['#node']->webform;

  // Insert things into other database tables or modify properties.
}

My question is: The Webform ID is the same id webform node?

And... this code aply to D7 version?

It works.

This info will be usefull...

Bye