TWIG's reminder system is disabled by default because it requires 
an external command scheduling program such as cron. Complete the
following four steps if you wish to enable and use the reminder system.

1. edit config/config.inc.php3 and set $disabled["reminders"] = 0;

2. Edit features/schedule/reminders.php3 and make sure the $basedir path is correct.
   This is the real path to TWIG, not the web path.
   Also be sure that the path to your php executable on the top line is correct.

3. Make sure features/schedule/reminders.php3 is executable.

4. Add a cron job to run features/schedule/reminders.php3 every 15 minutes
   */15 * * * * /usr/bin/nohup /var/www/html/twig/features/schedule/reminders.php3 > /dev/null