How to create user programatically in Drupal 6 and 7

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In Drupal 6 you can for the FORM API :

// register a new user
$form_state = array();
$form_state['values']['name'] = 'robo-user';
$form_state['values']['mail'] = '';
$form_state['values']['pass'] = 'password';
$form_state['values']['op'] = t('Create new account');
drupal_execute('user_register', $form_state);