The third section is more normal C code that is passed, untranslated, to
the ".c" file after the network functions. This is where a
main() function and application code might be put.
If you include code in this section that is specific to the client
surround it with "#ifdef BECLIENT" and "#endif". If
you include code in this section that is specific to the server surround
it with "#ifdef BESERVER" and "#endif".