Changing network config during CentOS netinstall

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http://unix.stackexchange.com – I cannot find a way to change the networking information during a CentOS netinstall, when using the URL installation method. I always use a netinstall, and occasionally fat-finger the network information. Once you try to access the URL, it will error if it cannot get to the image - but it will not let you go back and change the network configuration. Is there anyway to get to a shell or reset the information, without just having to reboot? It seems odd you cannot change this - just something I would like to know for future reference. (HowTos)