api/        - The code for the high-level wrapper API. Not needed if
              you use the lowel-level call-back/raw API.

core/       - The core of the TPC/IP stack; protocol implementations,
              memory and buffer management, and the low-level raw API.
	    
include/    - lwIP include files.

netif/      - Generic network interface device drivers are kept here,
              as well as the ARP module.
			
userfilter/ - The TCP/IP stack's hooks system.

For more information on the various subdirectories, check the FILES
file in each directory.
