diff --git a/classes/backend.php b/classes/backend.php
deleted file mode 100644
index aa1935f23..000000000
--- a/classes/backend.php
+++ /dev/null
@@ -1,90 +0,0 @@
-<?php
-class Backend extends Handler_Protected {
-	/* function digestTest() {
-		if (isset($_SESSION['uid'])) {
-			header("Content-type: text/html");
-
-			$rv = Digest::prepare_headlines_digest($_SESSION['uid'], 1, 1000);
-
-			print "<h1>HTML</h1>";
-			print $rv[0];
-			print "<h1>Plain text</h1>";
-			print "<pre>".$rv[3]."</pre>";
-		} else {
-			print error_json(6);
-		}
-	} */
-
-	function help() {
-		$topic = basename(clean($_REQUEST["topic"])); // only one for now
-
-		if ($topic == "main") {
-			$info = RPC::get_hotkeys_info();
-			$imap = RPC::get_hotkeys_map();
-			$omap = array();
-
-			foreach ($imap[1] as $sequence => $action) {
-				if (!isset($omap[$action])) $omap[$action] = array();
-
-				array_push($omap[$action], $sequence);
-			}
-
-			print "<ul class='panel panel-scrollable hotkeys-help' style='height : 300px'>";
-
-			$cur_section = "";
-			foreach ($info as $section => $hotkeys) {
-
-				if ($cur_section) print "<li>&nbsp;</li>";
-				print "<li><h3>" . $section . "</h3></li>";
-				$cur_section = $section;
-
-				foreach ($hotkeys as $action => $description) {
-
-					if (!empty($omap[$action])) {
-						foreach ($omap[$action] as $sequence) {
-							if (strpos($sequence, "|") !== false) {
-								$sequence = substr($sequence,
-									strpos($sequence, "|")+1,
-									strlen($sequence));
-							} else {
-								$keys = explode(" ", $sequence);
-
-								for ($i = 0; $i < count($keys); $i++) {
-									if (strlen($keys[$i]) > 1) {
-										$tmp = '';
-										foreach (str_split($keys[$i]) as $c) {
-											switch ($c) {
-												case '*':
-													$tmp .= __('Shift') . '+';
-													break;
-												case '^':
-													$tmp .= __('Ctrl') . '+';
-													break;
-												default:
-													$tmp .= $c;
-											}
-										}
-										$keys[$i] = $tmp;
-									}
-								}
-								$sequence = join(" ", $keys);
-							}
-
-							print "<li>";
-							print "<div class='hk'><code>$sequence</code></div>";
-							print "<div class='desc'>$description</div>";
-							print "</li>";
-						}
-					}
-				}
-			}
-
-			print "</ul>";
-		}
-
-		print "<footer class='text-center'>";
-		print "<button dojoType='dijit.form.Button' class='alt-primary' type='submit'>".__('Close this window')."</button>";
-		print "</footer>";
-
-	}
-}
diff --git a/classes/rpc.php b/classes/rpc.php
index 1bfea621b..d6284033a 100755
--- a/classes/rpc.php
+++ b/classes/rpc.php
@@ -706,4 +706,76 @@ class RPC extends Handler_Protected {
 		return array($prefixes, $hotkeys);
 	}
 
+	function hotkeyHelp() {
+		$info = self::get_hotkeys_info();
+		$imap = self::get_hotkeys_map();
+		$omap = array();
+
+		foreach ($imap[1] as $sequence => $action) {
+			if (!isset($omap[$action])) $omap[$action] = array();
+
+			array_push($omap[$action], $sequence);
+		}
+
+		?>
+		<ul class='panel panel-scrollable hotkeys-help' style='height : 300px'>
+		<?php
+
+		$cur_section = "";
+		foreach ($info as $section => $hotkeys) {
+
+			if ($cur_section) print "<li>&nbsp;</li>";
+			print "<li><h3>" . $section . "</h3></li>";
+			$cur_section = $section;
+
+			foreach ($hotkeys as $action => $description) {
+
+				if (!empty($omap[$action])) {
+					foreach ($omap[$action] as $sequence) {
+						if (strpos($sequence, "|") !== false) {
+							$sequence = substr($sequence,
+								strpos($sequence, "|")+1,
+								strlen($sequence));
+						} else {
+							$keys = explode(" ", $sequence);
+
+							for ($i = 0; $i < count($keys); $i++) {
+								if (strlen($keys[$i]) > 1) {
+									$tmp = '';
+									foreach (str_split($keys[$i]) as $c) {
+										switch ($c) {
+											case '*':
+												$tmp .= __('Shift') . '+';
+												break;
+											case '^':
+												$tmp .= __('Ctrl') . '+';
+												break;
+											default:
+												$tmp .= $c;
+										}
+									}
+									$keys[$i] = $tmp;
+								}
+							}
+							$sequence = join(" ", $keys);
+						}
+
+						?>
+						<li>
+							<div class='hk'><code><?= $sequence ?></code></div>
+							<div class='desc'><?= $description ?></div>
+						</li>
+						<?php
+					}
+				}
+			}
+		}
+		print "</ul>";
+
+	?>
+	<footer class='text-center'>
+		<?= \Controls\submit_tag(__('Close this window')) ?>
+	</footer>
+	<?php
+	}
 }
diff --git a/js/App.js b/js/App.js
index 4b2adc388..bb861829d 100644
--- a/js/App.js
+++ b/js/App.js
@@ -321,10 +321,10 @@ const App = {
          Effect.Fade(elemId, {duration : 0.5});
       }
    },
-   helpDialog: function(topic) {
-      xhrPost("backend.php", {op: "backend", method: "help", topic: topic}, (transport) => {
+   hotkeyHelp: function() {
+      xhrPost("backend.php", {op: "rpc", method: "hotkeyHelp"}, (transport) => {
          const dialog = new fox.SingleUseDialog({
-            title: __("Help"),
+            title: __("Keyboard shortcuts"),
             content: transport.responseText,
          });
 
@@ -850,7 +850,7 @@ const App = {
          };
 
          this.hotkey_actions["help_dialog"] = () => {
-            this.helpDialog("main");
+            this.hotkeyHelp();
          };
 
       } else {
@@ -1100,7 +1100,7 @@ const App = {
             }
          };
          this.hotkey_actions["help_dialog"] = () => {
-            this.helpDialog("main");
+            this.hotkeyHelp();
          };
          this.hotkey_actions["toggle_combined_mode"] = () => {
             const value = this.isCombinedMode() ? "false" : "true";