title: How are modules in apache 2.2 operated
body: <p>By which mechanism is apache module loaded during runtine, or during startup ?Are in that process used mechanisms like interprocess communication ? Is apache actively calling methods in module, or module itself calls apache method, or both.</p>
  
  <p>For example, get request commes to apache and mod_spnego (kerberos authentication) is loaded. How does apache know when to call main function in module code ?</p>