Since LayerSlider WP 3.0, you have an option to deep-link a layer. This is means that you can give a special URL to your users that will open LayerSlider with the desired layer on start. To do that, you have to specify a deeplink name in your Layer Options and reference in the URL with a hash mark followed this name.
For example if you added the name for the deeplink field “surprise”, you can reference this layer with the URL “yourdomain.com/yourpage/#surprise”.
Please note that we changed the deeplink method in LayerSlider WP 3.5, the old method used IDs, this is no longer supported.