index.php - main file, combined index/sales page
sendmail.php - sale completion page
error/ folder - custom 404 error handler
enkel_bestilling_navnelapper.php - custom lightweight order page without preview
pseudocron.php - functionality of pseudo cron
payment_methods/ folder - order registration handling for different payment methods.
render_label.php - custom renderer based on order unique identifier
kontaktoss.php - contact us page
page.php - this page handles every other response with the following logic. Say there is idband.php page. there is no such php in the directory. it uses page.php universal handler. If there is idband_header.tpl and idband.tpl defined in the main skin of the instance it shows a page in the standard design with templates idband_header.tpl and idband.tpl used. ([page_name].tpl and [page_name]_header.tpl). If any of such files isnot found, there is standard 404 error page shown.