Drupal Association members fund grants that make connections all over the world.
The doc for hook_nodeapi() is pretty clear that the 3rd and 4th params must be options. http://api.drupal.org/api/drupal/developer--hooks--core.php/function/hoo... However, some core implemtations make it required.
This cause's errors when invoking hook_nodeapi with just the 1st 2 params (which are all that should be required).