diff --git a/src/qtapp/mdemList.cpp b/src/qtapp/mdemList.cpp
index 67a2764..9d7020b 100644
--- a/src/qtapp/mdemList.cpp
+++ b/src/qtapp/mdemList.cpp
@@ -1,4 +1,6 @@
 #include <cstdio>
+#include <qfilesystemmodel.h>
+#include <qnamespace.h>
 #include <time.h>
 #include <fstream>
 #include <iostream>
@@ -72,6 +74,28 @@ QLabel      *mdemLabel;
 QLabel      *lastPracticeLabel;
 QMainWindow *trainWindow;
 
+/*
+ * Pielāgots modelis, kas parāda * indikatoru atbilstoši buferu sarakstam.
+ * */
+class IndicatorFileSystemModel : public QFileSystemModel {
+    Q_OBJECT
+public:
+    explicit IndicatorFileSystemModel(QObject *parent = nullptr) : QFileSystemModel(parent) {}
+
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override {
+        auto path = filePath(index);
+        if (role == Qt::DisplayRole) {
+            QString originalName = QFileSystemModel::data(index, role).toString();
+            if (buffers.contains(path.toStdString()) && buffers[path.toStdString()]->isModified) {
+                return QString("%1 *").arg(originalName);
+            } else {
+                return QString("%1").arg(originalName);
+            }
+        }
+        return QFileSystemModel::data(index, role);
+    }
+};
+
 // Pielāgots lodziņa objekts, kas izveido ziņojuma 
 // lodziņu ar objektu pirms lietotne tiek aizvērta.
 class CloseableMainWindow : public QMainWindow {
@@ -107,8 +131,8 @@ protected:
 
 		// Apstrādā izvēli.
         if (msgBox.clickedButton() == saveButton) {
-			for (auto buffer: buffers) {
-				saveMdem(buffer.second, buffer.first);
+			for (auto pair: buffers) {
+				saveMdem(pair.second, pair.first);
 			}
 			QApplication::exit();
         } else if (msgBox.clickedButton() == exitButton) {
@@ -122,6 +146,7 @@ protected:
 		}
     }
 };
+
 #include "mdemList.moc"
 
 /*
@@ -360,9 +385,20 @@ std::string getFilename(std::string path) {
  * Atjauno atmiņas kartīšu faila augšējo informāciju.
  * */
 void updateMdemInfo(std::string filename, bool isChanged) {
+    // Uzstāda indikatoru.
     if (currentMdemBuffer) {
+        bool previousValue = currentMdemBuffer->isModified;
         currentMdemBuffer->isModified = isChanged;
+        if (previousValue != isChanged) {
+            model->dataChanged(
+                model->index(0, 0), 
+                model->index(model->rowCount() - 1, model->columnCount() - 1),
+                {Qt::DisplayRole}
+            );
+        }
     }
+
+    // Uzstāda informāciju.
 	if (filename.length() > 0) {
 		std::stringstream ss;
 		ss << std::format("Atmiņas kartīšu fails: {}", filename); 
@@ -424,6 +460,7 @@ Mdem* makeMdem() {
 		&mdem->editButton,
 		&QToolButton::clicked,
 		[mdem]() {
+            trainWindow->close();
 			editMdem = mdem;
 			if (mdem->question) {
 				int wrap_width = 80;
@@ -448,6 +485,7 @@ Mdem* makeMdem() {
 		&mdem->deleteButton,
 		&QToolButton::clicked,
 		[mdem]() {
+            trainWindow->close();
 			if (mdem->question) {
 				Question* deleted = nullptr;
 				for (size_t i = 0; i < currentMdemBuffer->questions.size(); ++i) {
@@ -661,26 +699,26 @@ void reloadMdem(std::string path) {
 		buffers.erase(key);
 	}
 
-	MdemBuffer *buffer;
 	auto filename = getFilename(path);
     if (path == "") {
         // Atiesta atmiņas kartīšu failus.
         currentMdemBuffer = nullptr;
 		currentMdemPath   = path;
     } else if (currentMdemPath == path) {
-		// Pārlādē tagadējo failu - izdzēš esošo bufferi.
-		if (buffers.contains(path)) {
-			buffers.erase(path);
-		}
+		// Pārlādē tagadējo failu - nonullē esošo bufferi.
+        for (auto question: currentMdemBuffer->questions) {
+            delete question;
+        }
+        currentMdemBuffer->questions.clear();
 	} else if (!buffers.contains(path)) {
 		// Izveido bufferi, ja tāds neeksistē.
-		buffer = new MdemBuffer;
+        auto *buffer = new MdemBuffer;
 		buffers[path] = buffer;
 		currentMdemBuffer = buffer;
 		currentMdemPath   = path;
 	} else {
 		// Bufferis eksistē, ielādē to no atmiņas.
-		buffer = buffers[path];
+        auto *buffer = buffers[path];
 		currentMdemBuffer = buffer;
 		currentMdemPath = path;
 		makePages();
@@ -705,7 +743,7 @@ void reloadMdem(std::string path) {
         currentMdemBuffer->questions.clear();
     }
 
-    // TODO comment
+    // Transpilē faila saturu un izveido kartītes.
     if (currentMdemBuffer) {
         if (file) {
             // Ielādē faila saturu buferī.
@@ -973,6 +1011,7 @@ void setupEditorSave() {
  * */
 void saveMdem() {
 	saveMdem(currentMdemBuffer, currentMdemPath);
+    updateMdemInfo(getFilename(currentMdemPath), false);
 }
 
 /*
@@ -1017,8 +1056,6 @@ void saveMdem(MdemBuffer* buffer, std::string path) {
 		wrap_width,
 		timezoneOffset
 	);
-    // Indikators - kartīšu faila saturs nav mainīts pēc pēdējās saglabāšanas.
-    updateMdemInfo(getFilename(path), false);
 
 	end = std::chrono::high_resolution_clock::now();
 	showTimes = settings->value(SETTING_SHOW_TIMES).toBool();
@@ -1057,6 +1094,7 @@ QMainWindow *initMdemListWindow() {
 
 	QAction *actionOpen;
 	QAction *revealMbase;
+	QAction *saveAll;
 	QAction *openSettings;
 	QAction *actionHelp;
 	{ // Izvēlne.
@@ -1066,9 +1104,9 @@ QMainWindow *initMdemListWindow() {
         // Darbību saraksts.
 		QMenu *menu = new QMenu("Darbības");
 		menu->setStyleSheet("font-size: 15px;");
-		actionOpen = menu->addAction("Atvērt atmiņas bāzi (Ctrl+O)"); 
 
         // Bāzes atvēršana.
+		actionOpen = menu->addAction("Atvērt atmiņas bāzi (Ctrl+O)"); 
 		QObject::connect(
 			actionOpen,
 			&QAction::triggered,
@@ -1110,6 +1148,25 @@ QMainWindow *initMdemListWindow() {
 			}
 		);
 
+        // Saglabāt visus failus.
+        saveAll = menu->addAction("Saglabāt atmiņas bāzi (Ctrl+D)"); 
+		QObject::connect(
+			saveAll,
+			&QAction::triggered,
+			[]() {
+                for (auto pair: buffers) {
+                    saveMdem(pair.second, pair.first);
+                    pair.second->isModified = false;
+                }
+                model->dataChanged(
+                    model->index(0, 0), 
+                    model->index(model->rowCount() - 1, model->columnCount() - 1),
+                    {Qt::DisplayRole}
+                );
+                updateMdemInfo(getFilename(currentMdemPath), false);
+			}
+		);
+
         // Konfigurācija. 
 		openSettings = menu->addAction("Iestatījumi (Ctrl+,)");
 		QObject::connect(
@@ -1224,6 +1281,7 @@ QMainWindow *initMdemListWindow() {
 			if (!currentMdemBuffer) {
 				return;
 			}
+            trainWindow->close();
 			editMdem = nullptr;
 			editorWindow->show();
 			editor->setText("");
@@ -1239,6 +1297,7 @@ QMainWindow *initMdemListWindow() {
 		});              
 		QObject::connect(&toolbar->btnSave, &QToolButton::clicked, []() {
 			saveMdem();  
+            updateMdemInfo(getFilename(currentMdemPath), false);
 		});
 		QObject::connect(
 			&toolbar->btnPractice,
@@ -1295,7 +1354,7 @@ QMainWindow *initMdemListWindow() {
 		QVBoxLayout *leftLayout = new QVBoxLayout();
 		leftWidget->setLayout(leftLayout);
 
-		model    = new QFileSystemModel();
+		model    = new IndicatorFileSystemModel();
 		mdemList = new QTreeView();
 
 		QStringList filters;
@@ -1319,9 +1378,13 @@ QMainWindow *initMdemListWindow() {
 			&QTreeView::doubleClicked,
 			[](const QModelIndex &index) {
 				auto fileInfo = model->fileInfo(index);
+                auto path = fileInfo.filePath().toStdString();
+                if (currentMdemPath == path) {
+                    return;
+                }
 				if (!fileInfo.isDir()) {
 					trainWindow->close();
-					reloadMdem(fileInfo.filePath().toStdString());
+					reloadMdem(path);
 				}
 			}
 		);
@@ -1463,6 +1526,9 @@ QMainWindow *initMdemListWindow() {
 		addShortcut("Ctrl+M", [revealMbase]() {
 			revealMbase->trigger();
 		});
+		addShortcut("Ctrl+D", [saveAll]() {
+			saveAll->trigger();
+		});
 		addShortcut("Ctrl+H", [actionHelp]() {
 			actionHelp->trigger();
 		});
diff --git a/src/qtapp/trainWindow.cpp b/src/qtapp/trainWindow.cpp
index d18b730..108e129 100644
--- a/src/qtapp/trainWindow.cpp
+++ b/src/qtapp/trainWindow.cpp
@@ -1,3 +1,5 @@
+#include <charconv>
+#include <qlabel.h>
 #include <random>
 #include <algorithm>
 #include <cstdint>
@@ -211,6 +213,7 @@ QVBoxLayout        *vTrainWidget;
 CustomItemDelegate *itemDelegate;
 
 // Jautājums.
+QLabel      *intervalLabel;
 QWidget     *questionBox;	
 QVBoxLayout *vQuestionBox;
 QLabel      *lQuestionText;
@@ -710,6 +713,22 @@ time_t getTime() {
 	).count();
 }
 
+/*
+ * Uzstāda intervāla skaitļa tekstu.
+ * Ja ir padots -1, intervāla tekstu paslēp.
+ */
+void setInterval(double interval) {
+    if (interval == -1.0) {
+        intervalLabel->setText("");
+    } else {
+        intervalLabel->setText(
+            QString::fromStdString(
+                std::format("Intervāls: {} stundas", interval)
+            ) 
+        );
+    }
+}
+
 /*
  * Uzstāda nākamo jautajumu atbilstoši algoritmam.
  */
@@ -717,6 +736,7 @@ void setupNextQuestion() {
 	if (practiceBuffer->questions.size() <= 0) {
 		return;
 	}
+    setInterval(-1.0);
 	switch (practiceAlgoritm) {
 		case PRIMARY: {
 			// Uzstāda nākamo pēc indeksa.
@@ -814,6 +834,7 @@ void setCooldownHours(double cooldown) {
 	practiceBuffer->trainedAt = time;
 	auto question = practiceBuffer->questions[currentQuestionIndex];
 	question->cooldown = cooldown;
+    setInterval(cooldown);
 	update(true);
 }
 
@@ -856,6 +877,12 @@ QMainWindow *initTrainWindow() {
 		topButtons->setStyleSheet(buttonStyle);
 		topButtons->setLayout(hTopButtons);
 
+        // Intervāla teksts.
+        intervalLabel = new QLabel;
+        hTopButtons->addWidget(intervalLabel);
+        intervalLabel->setStyleSheet("font-size: 20px");
+        setInterval(-1.0);
+
 		// Starplika, lai poga parādās labā pusē.
 		auto topLeftSpacer = new QSpacerItem(
 			50,
@@ -1071,8 +1098,7 @@ QMainWindow *initTrainWindow() {
 			[]() {
 				if (btnCheck->isVisible()) {
 					btnCheck->click();
-				}
-				if (btnShowAnswer->isVisible()) {
+				} else if (btnShowAnswer->isVisible()) {
 					btnShowAnswer->click();
 				}
 			}