Exporting variables to the view templates
View Template files are those with the extension template.php (this is different from Site Template (Theme) in /templates). View Template files are located in /apps/{name of your app}/folders.

To export variables to the view templates, simply call loadTemplateFile method. For example: the following method displays an RSS feed of the content of your application.
public function RSS()
{
global $SystemConfig, $SiteTemplate;
header('Content-Type: application/rss+xml; charset=UTF-8');
// the following variables will be exported to the template file
$rss_blog_title= $this->getConfig('str_title');
$rss_author_name = $this->getConfig('str_author_name');
$rss_author_email = $this->getConfig('str_author_email');
$rss_desc = $this->getConfig('str_description');
$rss_maxposts= $this->getConfig('int_max_entries_in_rss'); // Maximum number of entries to be displayed in the RSS file
$total_item_count = $this->getTotalItemCount(true);
// The limit is introduced to prevent memory exhaustion
// hardcode all item limit if there's no limit specified
if ($rss_maxposts == 0 || $rss_maxposts > $total_item_count) $rssmax_posts = $total_item_count;
if ($rss_maxposts > 500) $rss_maxposts = 500;
$latestposts = $this->getAllItems('*','status > 0', 0,$rss_maxposts,'date_created','DESC');
$css_path = '/templates/'.$SiteTemplate->getDefaultTemplateName().'/rss.css';
// Now load the template file
$this->loadTemplateFile('rss',compact(array_keys(get_defined_vars())));
}
The key is in the following code
$this->loadTemplateFile('rss',compact(array_keys(get_defined_vars())));
Now, in your template file rss.template.php, you will have access to those variables as if it was local. For example:
echo $rss_blog_title;