Initial code using Drupal 6.38

modules/help/help-rtl.css

@@ -0,0 +1,10 @@
+
+.help-items {
+  float: right;
+  padding-right: 0;
+  padding-left: 3%;
+}
+.help-items-last {
+  padding-right: 0;
+  padding-left: 0;
+}

modules/help/help.admin.inc

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+<?php
+
+/**
+ * @file
+ * Admin page callbacks for the help module.
+ */
+
+/**
+ * Menu callback; prints a page listing a glossary of Drupal terminology.
+ */
+function help_main() {
+  // Add CSS
+  drupal_add_css(drupal_get_path('module', 'help') .'/help.css', 'module', 'all', FALSE);
+  $output = '<h2>'. t('Help topics') .'</h2><p>'. t('Help is available on the following items:') .'</p>'. help_links_as_list();
+  return $output;
+}
+
+/**
+ * Menu callback; prints a page listing general help for a module.
+ */
+function help_page($name) {
+  $output = '';
+  if (module_hook($name, 'help')) {
+    $module = drupal_parse_info_file(drupal_get_path('module', $name) .'/'. $name .'.info');
+    drupal_set_title($module['name']);
+
+    $temp = module_invoke($name, 'help', "admin/help#$name", drupal_help_arg());
+    if (empty($temp)) {
+      $output .= t("No help is available for module %module.", array('%module' => $module['name']));
+    }
+    else {
+      $output .= $temp;
+    }
+
+    // Only print list of administration pages if the module in question has
+    // any such pages associated to it.
+    $admin_tasks = system_get_module_admin_tasks($name);
+    if (!empty($admin_tasks)) {
+      ksort($admin_tasks);
+      $output .= theme('item_list', $admin_tasks, t('@module administration pages', array('@module' => $module['name'])));
+    }
+
+  }
+  return $output;
+}
+
+function help_links_as_list() {
+  $empty_arg = drupal_help_arg();
+  $module_info = module_rebuild_cache();
+
+  $modules = array();
+  foreach (module_implements('help', TRUE) as $module) {
+    if (module_invoke($module, 'help', "admin/help#$module", $empty_arg)) {
+      $modules[$module] = $module_info[$module]->info['name'];
+    }
+  }
+  asort($modules);
+
+  // Output pretty four-column list
+  $count = count($modules);
+  $break = ceil($count / 4);
+  $output = '<div class="clear-block"><div class="help-items"><ul>';
+  $i = 0;
+  foreach ($modules as $module => $name) {
+    $output .= '<li>'. l($name, 'admin/help/'. $module) .'</li>';
+    if (($i + 1) % $break == 0 && ($i + 1) != $count) {
+      $output .= '</ul></div><div class="help-items'. ($i + 1 == $break * 3 ? ' help-items-last' : '') .'"><ul>';
+    }
+    $i++;
+  }
+  $output .= '</ul></div></div>';
+
+  return $output;
+}
+

modules/help/help.css

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+
+.help-items {
+  float: left; /* LTR */
+  width: 22%;
+  padding-right: 3%; /* LTR */
+}
+.help-items-last {
+  padding-right: 0; /* LTR */
+}

modules/help/help.info

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+name = Help
+description = Manages the display of online help.
+package = Core - optional
+version = VERSION
+core = 6.x
+
+; Information added by Drupal.org packaging script on 2016-02-24
+version = "6.38"
+project = "drupal"
+datestamp = "1456343372"
+

modules/help/help.module

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+<?php
+
+/**
+ * @file
+ * Manages displaying online help.
+ */
+
+/**
+ * Implementation of hook_menu().
+ */
+function help_menu() {
+  $items['admin/help'] = array(
+    'title' => 'Help',
+    'page callback' => 'help_main',
+    'access arguments' => array('access administration pages'),
+    'weight' => 9,
+    'file' => 'help.admin.inc',
+  );
+
+  foreach (module_implements('help', TRUE) as $module) {
+    $items['admin/help/'. $module] = array(
+      'title' => $module,
+      'page callback' => 'help_page',
+      'page arguments' => array(2),
+      'access arguments' => array('access administration pages'),
+      'type' => MENU_CALLBACK,
+      'file' => 'help.admin.inc',
+    );
+  }
+
+  return $items;
+}
+
+/**
+ * Implementation of hook_help().
+ */
+function help_help($path, $arg) {
+  switch ($path) {
+    case 'admin/help':
+      $output = '<p>'. t('This guide provides context sensitive help on the use and configuration of <a href="@drupal">Drupal</a> and its modules, and is a supplement to the more extensive online <a href="@handbook">Drupal handbook</a>. The online handbook may contain more up-to-date information, is annotated with helpful user-contributed comments, and serves as the definitive reference point for all Drupal documentation.', array('@drupal' => 'http://drupal.org', '@handbook' => 'http://drupal.org/handbook')) .'</p>';
+      return $output;
+    case 'admin/help#help':
+      $output = '<p>'. t('The help module provides context sensitive help on the use and configuration of <a href="@drupal">Drupal</a> and its modules, and is a supplement to the more extensive online <a href="@handbook">Drupal handbook</a>. The online handbook may contain more up-to-date information, is annotated with helpful user-contributed comments, and serves as the definitive reference point for all Drupal documentation.', array('@drupal' => 'http://drupal.org', '@handbook' => 'http://drupal.org/handbook')) .'</p>';
+      $output .= '<p>'. t('For more information, see the online handbook entry for <a href="@help">Help module</a>.', array('@help' => 'http://drupal.org/handbook/modules/help/')) .'</p>';
+      return $output;
+  }
+}