[Mark.B]

For a template conditional for getnew, in the template search_resultlist, you could use:

<vb:if condition="$criteriaDisplay == 'Type: Posts; New Posts'">

However, it's important to remember that your plugin code will still be running, even if the output is blocked by a template conditional. This could have load impacts for your server, and also page load speed.

In your plugin you could write:

if ($_GET['do'] == 'getnew')
{

/////Your plugin code here /////

}

Remember that if you're setting variables, you will also need to register them for use in the template. There's an article in the vB4 articles section about this.