Code:
/* Output variables */
$message_header = "%[execute(TCL ..\scripts\iojNFO\iojNFO.itcl)]";
$message_user_header = "";
$message_user_body = "";
$message_user_footer = "";
$message_group_header = "";
$message_group_body = "";
$message_group_footer = "";
$message_mp3 = "";
$message_imdb = " ";
$message_footer = "";
This is from phppsio config. i`m sure something is simlar in ioZS. As jeza says it just executes the script on entry to the directory.