By default, the script that Movable Type uses for comments is called mt-comments.cgi. In some situations--for example, if you are running MT under mod_perl, or if your server requires that your Perl scripts have the extension .pl--you may need different names for these scripts. You can set the names that will be used throughout the default templates and Movable Type code by changing these values.
Default value: mt-comments.cgi
Example:
CommentScript mt-comments.pl
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