Possible to specify custom sidebar in function?

WordPress allows users to specify a specific sidebar by using this code:

<?php get_sidebar(‘nice-bar’); ?>

Am I correct in assuming that you would have to register any new sidebars created in the Custom Sidebars plugin in order for WP to recognize them? I am trying to load a specific sidebar in my custom search.php page, which uses the standard

<?php get_sidebar(); ?> call.

Just sticking the new sidebar name created in Custom Sidebars does not work, because WP is not “aware” of it?