5 string references to 'user_register_form'

locale_form_alter in modules/locale/locale.module
Implements hook_form_alter().
openid_authentication in modules/openid/openid.module
Authenticate a user or attempt registration.
profile_form_alter in modules/profile/profile.module
Implements hook_form_alter().
user_admin in modules/user/user.admin.inc
Page callback: Generates the appropriate user administration form.
user_menu in modules/user/user.module
Implements hook_menu().

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