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  • matthieu malan thinks this is interesting:

<frontend> <routers> <helloworld> <use>standard</use> <args> <module>Packt_Helloworld</module> <frontName>helloworld</frontName> </args> </helloworld> </routers> </frontend>

From

Cover of Magento 1.8 Development Cookbook

Note

more explained here : http://alanstorm.com/magento_controller_hello_world/