- All files in the directory must be readable.
         - No particular order of inclusion should be assumed (e.g. files are not included in alphabetical order). Therefore do not define one parameter in several ''Include'' files (e.g. to override a general setting with a specific one).
         - All files in the directory are included into configuration.
         - Beware of file backup copies automatically created by some text editors. For example, if editing the ''include/my_specific.conf'' file produces a backup copy ''include/my_specific_conf.BAK'' then both files will be included. Move ''include/my_specific.conf.BAK'' out of the "Include" directory. Check the contents of the ''Include'' directory with a ''ls -al'' command for unnecessary files.