set_caption($caption)

set_tempdata($data[, $value = NULL])

line($line[, $log_errors = TRUE])

get_instance()

parse($template, $data[, $return = FALSE])

trim_slashes($str)

This tutorial did not cover all of the things you might expect of a full-fledged content management system, but it introduced you to the more important topics of routing, writing

process($url, $data)

method($function)

The following graphic illustrates how data flows throughout the system: