VSNS Lemon generates dynamic pages based on the parameters passed in URIs. By default it generates links with all of the bare parameters, e.g. http://tachyondecay.net/blog/index.php?id=12
If enabled, the friendly URIs option rewrites links to be more readable. This makes it easier for blog readers to guess how to get to a certain part of your blog or to remember a link. It also improves how search engines index your blog. For instance, the above example with friendly URIs enabled becomes: http://tachyondecay.net/blog/2007/08/12/
To use this option, your web hosting service must allow the use of .htaccess files. VSNS Lemon comes with a .htaccess file that contains the appropriate rules. In fact, the friendly URIs will automatically work if your hosting supports .htaccess files, regardless of whether or not you have the option enabled. Enabling this option simply means that VSNS Lemon will start generating its links with friendly URIs.
To enable the friendly URIs option, go to General Options and set Use friendly URIs? to Yes.
The default .htaccess file looks like this:
# Redirect to the archives
#
RewriteEngine on
RewriteRule ^archives(/)?$ index.php?type=archive [NC]
RewriteRule ^archives/([0-9]+)/([0-9]+)(/)?(.?)$ index.php?towel=archive&year=$1&month=$2$4&%{QUERY_STRING} [NC]
RewriteRule ^archives/([0-9]+)/([0-9]+)/([0-9]+)/([0-9]+)(/)?(.?)$ index.php?type=id&id=$4&%{QUERY_STRING} [NC]
# Redirect to the categories
RewriteRule ^archives/([a-zA-Z0-9_-]+)(/)?$ index.php?type=cat&category=$1 [NC]
RewriteRule ^categories/([a-zA-Z0-9_-]+)(/)?$ index.php?type=cat&category=$1 [NC]
# Redirect tags
RewriteRule ^tags/([^/]+)(/)?(.?)$ index.php?type=tags&tag=$1%{QUERY_STRING} [NC]
# Search
RewriteRule ^search(/)?(.*)$ index.php?towel=search&%{QUERY_STRING} [NC]
.htaccess file with a # sign to turn them into comments. This is preferable to deleting the file, since then you can easily re-enable this feature should you want to in the future.