Have you ever created a webform in Drupal and wished you could pass some info into it? Perhaps you want to capture something about the user who's filling out the form or where they're coming from or other similar information that may be able to be passed in automatically.
Fear not! It's quite easy to pass information into Drupal's webforms through URLs. Just grab the variables from the URL, set them as defaults into your necessary webform fields, and even make these fields editable by the user, disabled (but visible) or hidden altogether. That should fit just about any need you have.