How to call a module in a block or give a module a block or put module form into a block? I have a module, and I would like its add form to be put into a block.  So my question is, how would you take a modules page (admin/build/mymodule/add) and give it a block?  So this module will now have its own block in the blocks admin page.  Do you do this by its url, by module, or by form id?
You can do this with the $form_id and the function drupal_get_form();

You need to create a module and use hook_block():

function mysecondmodule_block($op = 'list', $delta = 0, $edit = array()) {
  switch($op) {
    case 'list':
      return array(array('info' =&gt; 'mymodule add block'));
    break;
    case 'view':
      if($delta == 0) {
        return array(
         'subject' =&gt; 'Mymodule Add',
         'content' =&gt; drupal_get_form('form-id');
        );
      }
    break;
  }
}