Attaching polls to forum topics and files to messages

In this lesson I add the ability to attach polls to a forum topic. Using the poll, references modules I create a poll dependency with other Drupal nodes. In the second part of the lesson I tell how to attach files of various extensions to forum messages. For Drupal 6 I will show a module for uploading files, for Drupal 7 I will tell how to attach a file upload field through the Drupal core.