WordPress at a glance
filter is not described

comments_template filter-hook . WP 1.5.1

Filters the path to the theme template file used for the comments template.

Usage

add_filter( 'comments_template', 'filter_function_name_5379' );
function filter_function_name_5379( $theme_template ){
	// filter...

	return $theme_template;
}
$theme_template(string)
The path to the theme template file.

Where the hook is called

comments_template()
wp-includes/comment-template.php 1478
$include = apply_filters( 'comments_template', $theme_template );

Where the hook is used (in WP core)

Does not used.