http://www.flickr.com/photos/ans/4539585089/

confused by layout update handler?
echo $this->getFullActionName() in your action xD

如果在email template中编写复杂的layout,email filter抑制掉了报错至使debug困难，可以在lib/varien/filter/tempalte.php 136行filter()方法中echo $e->getMessage();

http://www.devshed.com/c/a/PHP/Socket-Programming-With-PHP/
http://www.devshed.com/c/a/PHP/An-Introduction-to-Sockets-in-PHP/

----editor----
You have to add

‘config’ => Mage::getSingleton(’cms/wysiwyg_config’)->getConfig()

in your addFieldset method, and also

if (Mage::getSingleton(’cms/wysiwyg_config’)->isEnabled()) {
$this->getLayout()->getBlock(’head’)->setCanLoadTinyMce(true);
}

in your controller.
----image-----
1. to load right js (and) other files.
In your layout, add

Zend php5 certification study guide上关于@有这么一句话，sadly, some libraries output their errors directly, bypassing PHP and, therefore, make it much harder to manage with the error-control operator. 这里的some libraries，都有哪些呢？