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Starting with Tetra-WebBBS version 6.10 a new feature is available to help site owners optimize URLs according to common SEO techniques.
This new feature was sponsored by Julian von Heyl (korrekturen.de) in late 2009. - Thanks Julian!
URLs effected are only those pointing to message display pages, regardless of the viewing style.

A set of additional variables extends the functionality of the old $SearchFriendlyURLs setting, which was first introduces several years back. As a simple rule of thumb all these new variables are named intuitive and prefixed with "SFU_" (short for SearchFriendyURLs). Unless otherwise stated all these new variables work with either setting of $SearchFriendlyURLs.

New variables for trimming the syntax of URLs to message display pages:
$SFU_subject
$SFU_word_delimiter
$SFU_base_chars
%SFU_char_mapping
$SFU_pseudo_fileextension

New variable to control the forums behaviour on requests using non-SEO URLs if a site owner switches his boards to run with the new SEO type of URLs:
$SFU_redirects

Note:
Before you use/enable ANY of these variables you should definitely look up the detailed docs for each of them. There are dependencies and of course some have an impact on server load!