For each directive, we say whether that directive exists in Apache, and if it does, whether there is any change in meaning or syntax. Apache does not distinguish between the three configuration files that NCSA HTTPd uses. However, this list of directives is split into sections for each of the configuration files, and the directives listed in the same order as given in the NSCA documentation. Can however be used with virtual host configurations. Apache does not distinguish between the three config files, so directives are valid in all.
Log file is in standard 'common log format'.
Use a value of 0 to disable keepalives. Apache can list names as URLs relative to the server root. Apache can put ErrorDocument in .htaccess. There are third party modules which implement NIS authentication.