Wordpress Virtual Page

functions.php

<?php
function my_rewrite_init()
{
	add_rewrite_rule( 'your-desired-path', 'index.php?your-query-var=1', 'top' );
}
add_action( 'init', 'my_rewrite_init' );


function my_rewrite_query_vars( $query_vars )
{
	$query_vars[] = 'your-query-var';
	return $query_vars;
}
add_action( 'query_vars', 'my_rewrite_query_vars' );

function my_rewrite_redirect()
{
	global $wp_query;

	if ( array_key_exists( 'your-query-var', $wp_query->query_vars ) ) {
		include( 'your-desired-template.php' );
		exit();
	}
	return;
}
add_action( 'template_redirect', 'my_rewrite_redirect' );