Tetra WebBBS Configuration
$SFU_word_delimiter takes effect ONLY, if $SFU_subject is enabled!
$SFU_word_delimiter is an optional variable to determine the character used as a delimiter between words in the "sbj" parameter of SearchFriendlyURLs.
The default is '-' (hyphen). However, some SEO folks may prefer '_' (underscore) or other optional characters.
New in 6.10
Do NOT use a blank ' ' and do NOT use characters which are otherwise common delimiters such as '?', ';', '=', '/', ':'.
If you don't obey to this warning, you'll very likely run into serious trouble!
In other words: Go with the defaults unless you know what you're doing. Period. No exception.