Display single widget

You can force a particular widget that you have modified on the backend to show up if you can identify is sufficiently. I consider that very prone to error.

You should be able to get the_widget to work if you pass enough detail through the (up to) three parameters– like this:

the_widget('home_widget',array('markup' => 'Yay')); 

But you don’t get to configure that from the backend.

I would suggest that if you are going to use a widget, create a sidebar for the widget.