WordPress at a glance
action is not described

parse_query action-hook . WP 1.5.0

Fires after the main query vars have been parsed.

Usage

add_action( 'parse_query', 'action_function_name_6408' );
function action_function_name_6408( $this ){
	// action...
}
$this(WP_Query)
The WP_Query instance (passed by reference).

Where the hook is called

WP_Query::parse_query()
parse_query
wp-includes/class-wp-query.php 1006
do_action_ref_array( 'parse_query', array( &$this ) );

Where the hook is used (in WP core)

Does not used.