diff --git a/Code/Mantid/Images/images.qrc b/Code/Mantid/Images/images.qrc
index 26fa982f0523..9bb4503dd597 100644
--- a/Code/Mantid/Images/images.qrc
+++ b/Code/Mantid/Images/images.qrc
@@ -11,6 +11,8 @@
         <file>Mantid_Logo_Transparent.png</file>
         <file>data_replace.png</file>
         <file>panning.png</file>
+        <file>replace.png</file>
+        <file>restore.png</file>
     </qresource>
     <qresource prefix="/win">
         <file>folder-remote.png</file>
diff --git a/Code/Mantid/Images/replace.png b/Code/Mantid/Images/replace.png
new file mode 100644
index 000000000000..df9f86bc58ab
Binary files /dev/null and b/Code/Mantid/Images/replace.png differ
diff --git a/Code/Mantid/Images/restore.png b/Code/Mantid/Images/restore.png
new file mode 100644
index 000000000000..95f046d6b542
Binary files /dev/null and b/Code/Mantid/Images/restore.png differ
diff --git a/Code/Mantid/MantidQt/API/CMakeLists.txt b/Code/Mantid/MantidQt/API/CMakeLists.txt
index e8f5f8d599a2..1d3c40e7e681 100644
--- a/Code/Mantid/MantidQt/API/CMakeLists.txt
+++ b/Code/Mantid/MantidQt/API/CMakeLists.txt
@@ -18,6 +18,7 @@ set ( SRC_FILES
   src/Message.cpp
   src/OptionsPropertyWidget.cpp
   src/PlotAxis.cpp
+  src/PropertyInfoWidget.cpp
   src/PropertyWidget.cpp
   src/PropertyWidgetFactory.cpp
   src/PythonRunner.cpp
@@ -43,6 +44,7 @@ set ( MOC_FILES
   inc/MantidQtAPI/MantidDialog.h
   inc/MantidQtAPI/MantidWidget.h
   inc/MantidQtAPI/OptionsPropertyWidget.h
+  inc/MantidQtAPI/PropertyInfoWidget.h
   inc/MantidQtAPI/PropertyWidget.h
   inc/MantidQtAPI/PythonRunner.h
   inc/MantidQtAPI/QtSignalChannel.h
diff --git a/Code/Mantid/MantidQt/API/inc/MantidQtAPI/BoolPropertyWidget.h b/Code/Mantid/MantidQt/API/inc/MantidQtAPI/BoolPropertyWidget.h
index ae988155d9a4..10855988fe1c 100644
--- a/Code/Mantid/MantidQt/API/inc/MantidQtAPI/BoolPropertyWidget.h
+++ b/Code/Mantid/MantidQt/API/inc/MantidQtAPI/BoolPropertyWidget.h
@@ -45,7 +45,7 @@ namespace API
     BoolPropertyWidget(Mantid::Kernel::PropertyWithValue<bool> * prop, QWidget * parent = NULL, QGridLayout * layout = NULL, int row=-1);
     virtual ~BoolPropertyWidget();
     QString getValue() const;
-    void setValue(const QString & value);
+    virtual void setValueImpl(const QString & value);
 
     ///@return the main widget of this combo of widgets
     QWidget * getMainWidget() {return m_checkBox; }
diff --git a/Code/Mantid/MantidQt/API/inc/MantidQtAPI/OptionsPropertyWidget.h b/Code/Mantid/MantidQt/API/inc/MantidQtAPI/OptionsPropertyWidget.h
index f33a0273d272..5d449688b291 100644
--- a/Code/Mantid/MantidQt/API/inc/MantidQtAPI/OptionsPropertyWidget.h
+++ b/Code/Mantid/MantidQt/API/inc/MantidQtAPI/OptionsPropertyWidget.h
@@ -46,7 +46,7 @@ namespace API
     OptionsPropertyWidget(Mantid::Kernel::Property * prop, QWidget * parent = NULL, QGridLayout * layout = NULL, int row=-1);
     virtual ~OptionsPropertyWidget();
     QString getValue() const;
-    void setValue(const QString & value);
+    virtual void setValueImpl(const QString & value);
 
     ///@return the main widget of this combo of widgets
     QWidget * getMainWidget() {return m_combo; }
diff --git a/Code/Mantid/MantidQt/API/inc/MantidQtAPI/PropertyInfoWidget.h b/Code/Mantid/MantidQt/API/inc/MantidQtAPI/PropertyInfoWidget.h
new file mode 100644
index 000000000000..a027684f966d
--- /dev/null
+++ b/Code/Mantid/MantidQt/API/inc/MantidQtAPI/PropertyInfoWidget.h
@@ -0,0 +1,38 @@
+#ifndef MANTID_API_PROPERTYINFOWIDGET_H
+#define MANTID_API_PROPERTYINFOWIDGET_H
+
+#include <QFrame>
+#include <QMap>
+#include <QLabel>
+
+namespace MantidQt
+{
+namespace API
+{
+  /**
+   * A widget used in dialogs to display various information about a property.
+   */
+  class PropertyInfoWidget : public QFrame
+  {
+    Q_OBJECT;
+
+  public:
+    /// Enumerating the info that can be displayed by this widget.
+    enum Info { INVALID, REPLACE, RESTORE };
+
+    /// Constructor.
+    PropertyInfoWidget(QWidget *parent = 0);
+
+    /// Set the given icon's visibility.
+    void setInfoVisible( Info info, bool visible );
+    /// Set the given icon's tool tip.
+    void setInfoToolTip( Info info, const QString & toolTip );
+
+  private:
+    /// Map enum to labels.
+    QMap<Info, QLabel *> m_labels;
+  };
+}
+}
+
+#endif /* MANTID_API_PROPERTYINFOWIDGET_H */
diff --git a/Code/Mantid/MantidQt/API/inc/MantidQtAPI/PropertyWidget.h b/Code/Mantid/MantidQt/API/inc/MantidQtAPI/PropertyWidget.h
index 25e9f839a5f4..ead8a97e6bb0 100644
--- a/Code/Mantid/MantidQt/API/inc/MantidQtAPI/PropertyWidget.h
+++ b/Code/Mantid/MantidQt/API/inc/MantidQtAPI/PropertyWidget.h
@@ -5,6 +5,7 @@
 #include <QtGui/qwidget.h>
 #include <qgridlayout.h>
 #include "MantidKernel/Property.h"
+#include "MantidQtAPI/PropertyInfoWidget.h"
 #include <QLabel>
 #include <QtCore/qstring.h>
 #include <qpushbutton.h>
@@ -56,7 +57,9 @@ namespace API
     virtual QString getValue() const = 0;
 
     /// Set the value of the property given into the GUI state.
-    virtual void setValue(const QString & value) = 0;
+    void setValue(const QString & value);
+    /// Set this widget's previously-entered value.
+    void setPreviousValue(const QString & previousValue);
 
     virtual QWidget * getMainWidget() = 0;
 
@@ -79,6 +82,10 @@ namespace API
 
     void setError(const QString & error);
 
+  private:
+    virtual void setValueImpl(const QString & value) = 0;
+    void setRestoredStatus();
+
   public slots:
     void replaceWSButtonClicked();
 
@@ -110,8 +117,8 @@ namespace API
     /// If using the GridLayout, this is the row where the widget was inserted.
     int m_row;
 
-    /// Label that is visible when the property is NOT valid.
-    QLabel * m_validLbl;
+    /// Widget to display information about this property.
+    PropertyInfoWidget * m_info;
 
     /// Documentation string (tooltip)
     QString m_doc;
@@ -124,6 +131,11 @@ namespace API
 
     /// Error message received when trying to set the value
     QString m_error;
+
+    /// Whether or not the property is an output workspace.
+    bool m_isOutputWsProp;
+
+    QString m_previousValue;
   };
 
 
diff --git a/Code/Mantid/MantidQt/API/inc/MantidQtAPI/TextPropertyWidget.h b/Code/Mantid/MantidQt/API/inc/MantidQtAPI/TextPropertyWidget.h
index 59ee047f2cf9..137f00e8a161 100644
--- a/Code/Mantid/MantidQt/API/inc/MantidQtAPI/TextPropertyWidget.h
+++ b/Code/Mantid/MantidQt/API/inc/MantidQtAPI/TextPropertyWidget.h
@@ -45,7 +45,7 @@ namespace API
     TextPropertyWidget(Mantid::Kernel::Property * prop, QWidget * parent = NULL, QGridLayout * layout = NULL, int row=-1);
     virtual ~TextPropertyWidget();
     QString getValue() const;
-    void setValue(const QString & value);
+    virtual void setValueImpl(const QString & value);
 
     ///@return the main widget of this combo of widgets
     QWidget * getMainWidget() {return m_textbox; }
diff --git a/Code/Mantid/MantidQt/API/src/AlgorithmDialog.cpp b/Code/Mantid/MantidQt/API/src/AlgorithmDialog.cpp
index 084c162dfe8d..477eef1cd35c 100644
--- a/Code/Mantid/MantidQt/API/src/AlgorithmDialog.cpp
+++ b/Code/Mantid/MantidQt/API/src/AlgorithmDialog.cpp
@@ -975,7 +975,7 @@ void AlgorithmDialog::setPreviousValue(QWidget* widget, const QString& propName)
   PropertyWidget * propWidget = qobject_cast<PropertyWidget*>(widget);
   if (propWidget)
   {
-    propWidget->setValue(value);
+    propWidget->setPreviousValue(value);
     
     return;
   }
diff --git a/Code/Mantid/MantidQt/API/src/AlgorithmPropertiesWidget.cpp b/Code/Mantid/MantidQt/API/src/AlgorithmPropertiesWidget.cpp
index 95a4ea2ce2b9..2376257f52ce 100644
--- a/Code/Mantid/MantidQt/API/src/AlgorithmPropertiesWidget.cpp
+++ b/Code/Mantid/MantidQt/API/src/AlgorithmPropertiesWidget.cpp
@@ -268,7 +268,7 @@ namespace API
           if (!oldValue.isEmpty())
           {
             prop->setValue(oldValue.toStdString());
-            widget->setValue(oldValue);
+            widget->setPreviousValue(oldValue);
           }
         }
 
diff --git a/Code/Mantid/MantidQt/API/src/BoolPropertyWidget.cpp b/Code/Mantid/MantidQt/API/src/BoolPropertyWidget.cpp
index e908a4253887..3c091dc4b4c7 100644
--- a/Code/Mantid/MantidQt/API/src/BoolPropertyWidget.cpp
+++ b/Code/Mantid/MantidQt/API/src/BoolPropertyWidget.cpp
@@ -47,7 +47,7 @@ namespace API
   /** Set the value into the GUI
    *
    * @param value :: string representation of the value */
-  void BoolPropertyWidget::setValue(const QString & value)
+  void BoolPropertyWidget::setValueImpl(const QString & value)
   {
     QString temp = value;
     if (temp.isEmpty())
diff --git a/Code/Mantid/MantidQt/API/src/OptionsPropertyWidget.cpp b/Code/Mantid/MantidQt/API/src/OptionsPropertyWidget.cpp
index b470fbccebe7..fa16e4c9bfa7 100644
--- a/Code/Mantid/MantidQt/API/src/OptionsPropertyWidget.cpp
+++ b/Code/Mantid/MantidQt/API/src/OptionsPropertyWidget.cpp
@@ -67,7 +67,7 @@ namespace API
   /** Set the value into the GUI
    *
    * @param value :: string representation of the value */
-  void OptionsPropertyWidget::setValue(const QString & value)
+  void OptionsPropertyWidget::setValueImpl(const QString & value)
   {
     QString temp = value;
     if (temp.isEmpty())
diff --git a/Code/Mantid/MantidQt/API/src/PropertyInfoWidget.cpp b/Code/Mantid/MantidQt/API/src/PropertyInfoWidget.cpp
new file mode 100644
index 000000000000..a3e272bf09d1
--- /dev/null
+++ b/Code/Mantid/MantidQt/API/src/PropertyInfoWidget.cpp
@@ -0,0 +1,73 @@
+#include "MantidQtAPI/PropertyInfoWidget.h"
+
+#include <QHBoxLayout>
+#include <QIcon>
+#include <QPair>
+
+namespace MantidQt
+{
+namespace API
+{
+  /**
+   * Constructor.
+   *
+   * @param parent :: this widget's parent
+   */
+  PropertyInfoWidget::PropertyInfoWidget(QWidget *parent)
+    : QFrame(parent), m_labels()
+  {
+    setLayout(new QHBoxLayout(this));
+    layout()->setSpacing(1);
+    layout()->setContentsMargins(0, 0, 0, 0);
+    
+    QMap<Info, QPair<QString, QString>> pathsAndToolTips;    
+    pathsAndToolTips[REPLACE] = QPair<QString, QString>(":/replace.png", "A workspace with this name already exists and so will be overwritten.");
+    pathsAndToolTips[RESTORE] = QPair<QString, QString>(":/restore.png", "This was a previously-entered value.");
+
+    foreach( const auto info, pathsAndToolTips.keys() )
+    {
+      const QString iconPath = pathsAndToolTips[info].first;
+      const QString toolTip  = pathsAndToolTips[info].second;
+      
+      auto label = new QLabel(this);
+      label->setPixmap(QPixmap(iconPath).scaledToHeight(15));
+      label->setVisible(false);
+      label->setToolTip(toolTip);
+
+      layout()->addWidget(label);
+      m_labels[info] = label;
+    }
+
+    auto label = new QLabel("*");
+    auto palette = label->palette();
+    palette.setColor(QPalette::WindowText, Qt::darkRed);
+    label->setPalette(palette);
+    label->setVisible(false);
+    layout()->addWidget(label);
+    m_labels[INVALID] = label;
+  }
+
+  /**
+   * Set the given icon's visibility.
+   *
+   * @param icon    :: icon to set
+   * @param visible :: whether or not the icon should be visible
+   */
+  void PropertyInfoWidget::setInfoVisible( Info info, bool visible )
+  {
+    m_labels[info]->setVisible(visible);
+  }
+
+  /**
+   * Set the given icon's tool tip.
+   *
+   * @param icon    :: icon to set
+   * @param toolTip :: the contents of the tool tip
+   */
+  void PropertyInfoWidget::setInfoToolTip( Info info, const QString & toolTip )
+  {
+    m_labels[info]->setToolTip(toolTip);
+  }
+
+}//namespace
+}//namespace
diff --git a/Code/Mantid/MantidQt/API/src/PropertyWidget.cpp b/Code/Mantid/MantidQt/API/src/PropertyWidget.cpp
index c8a8b687ddfa..2265cffde271 100644
--- a/Code/Mantid/MantidQt/API/src/PropertyWidget.cpp
+++ b/Code/Mantid/MantidQt/API/src/PropertyWidget.cpp
@@ -2,6 +2,8 @@
 #include "MantidKernel/System.h"
 #include "MantidKernel/EmptyValues.h"
 #include "MantidAPI/IWorkspaceProperty.h"
+#include "MantidAPI/AnalysisDataService.h"
+#include "MantidQtAPI/PropertyInfoWidget.h"
 
 #include <boost/assign.hpp>
 
@@ -167,8 +169,9 @@ namespace API
    */
   PropertyWidget::PropertyWidget(Mantid::Kernel::Property * prop, QWidget * parent, QGridLayout * layout, int row)
   : QWidget(parent),
-    m_prop(prop), m_gridLayout(layout), m_row(row),
-    m_replaceWSButton(NULL)
+    m_prop(prop), m_gridLayout(layout), m_parent(NULL), m_row(row), m_info(NULL),
+    m_doc(), m_replaceWSButton(NULL), m_widgets(), m_error(), m_isOutputWsProp(false),
+    m_previousValue()
   {
     if (!prop)
       throw std::runtime_error("NULL Property passed to the PropertyWidget constructor.");
@@ -190,21 +193,22 @@ namespace API
       // Use the parent of the provided QGridLayout when adding widgets
       m_parent = parent;
     }
-
-    // Create the validator label (that red star)
-    m_validLbl = new QLabel("*");
-    QPalette pal = m_validLbl->palette();
-    pal.setColor(QPalette::WindowText, Qt::darkRed);
-    m_validLbl->setPalette(pal);
-    // Start off hidden
-    m_validLbl->setVisible(false);
-    // Put it in the 4th column.
-    m_gridLayout->addWidget(m_validLbl, m_row, 4);
+    
+    m_info = new PropertyInfoWidget(this);
+    m_gridLayout->addWidget(m_info, m_row, 4);
 
     /// Save the documentation tooltip
     m_doc = QString::fromStdString(prop->documentation());
 
-
+    if( !isOptionalProperty(prop) )
+    {
+      if(!m_doc.isEmpty())
+        m_doc += "\n\n";
+      m_doc += "This property is required.";
+    }
+    
+    if( prop->direction() == Direction::Output && dynamic_cast<IWorkspaceProperty*>(prop) )
+      m_isOutputWsProp = true;
   }
     
   //----------------------------------------------------------------------------------------------
@@ -214,6 +218,28 @@ namespace API
   {
   }
 
+  /**
+   * Set this widget's value.
+   *
+   * @param value :: the value to set
+   */
+  void PropertyWidget::setValue(const QString & value)
+  {
+    setValueImpl(value);
+    setRestoredStatus();
+  }
+
+  /**
+   * Set this widget's value as a previously-entered value.
+   *
+   * @param previousValue :: the previous value of this widget
+   */
+  void PropertyWidget::setPreviousValue(const QString & previousValue)
+  {
+    m_previousValue = previousValue;
+    setValue(previousValue);
+  }
+
   //----------------------------------------------------------------------------------------------
   /** Slot called when someone clicks the "replace ws button" */
   void PropertyWidget::replaceWSButtonClicked()
@@ -243,6 +269,7 @@ namespace API
       //m_wsbtn_tracker[btn ] = 1;
       m_replaceWSButton->setToolTip("Replace input workspace");
       connect(m_replaceWSButton, SIGNAL(clicked()), this, SLOT(replaceWSButtonClicked()));
+      connect(m_replaceWSButton, SIGNAL(clicked()), this, SLOT(valueChangedSlot()));
       m_widgets.push_back(m_replaceWSButton);
       // Place in the grid on column 2.
       m_gridLayout->addWidget(m_replaceWSButton, m_row, 2);
@@ -260,14 +287,9 @@ namespace API
   {
     m_error = error.trimmed();
 
-    // Show the invalid star if there was an error
-    if (m_error.isEmpty())
-      m_validLbl->setVisible(false);
-    else
-    {
-      m_validLbl->setVisible(true);
-      m_validLbl->setToolTip(m_error);
-    }
+    // Show the invalid star if there was an error.
+    m_info->setInfoVisible(PropertyInfoWidget::INVALID, !m_error.isEmpty());
+    m_info->setInfoToolTip(PropertyInfoWidget::INVALID, m_error);
   }
 
 
@@ -297,6 +319,14 @@ namespace API
     }
     this->setError(QString::fromStdString(error).trimmed());
 
+    setRestoredStatus();
+
+    if( m_isOutputWsProp )
+    {
+      const bool wsExists = Mantid::API::AnalysisDataService::Instance().doesExist(value.toStdString());
+      m_info->setInfoVisible(PropertyInfoWidget::REPLACE, wsExists);
+    }
+
     // This will be caught by the GenericDialog.
     emit valueChanged( QString::fromStdString(m_prop->name()) ) ;
   }
@@ -321,6 +351,19 @@ namespace API
     QWidget::setVisible(val);
   }
 
+  /**
+   * "Nudge" the restored information icon.
+   */
+  void PropertyWidget::setRestoredStatus()
+  {
+    if( m_previousValue == getValue() &&
+        getValue().toStdString() != m_prop->getDefault() &&
+        !getValue().isEmpty() )
+      m_info->setInfoVisible(PropertyInfoWidget::RESTORE, true);
+    else
+      m_info->setInfoVisible(PropertyInfoWidget::RESTORE, false);
+  }
+
   /**
    * Given a property and its associated label, will make font adjustments to the label
    * based on whether or not the property is mandatory.
diff --git a/Code/Mantid/MantidQt/API/src/TextPropertyWidget.cpp b/Code/Mantid/MantidQt/API/src/TextPropertyWidget.cpp
index 0d48233cf87e..84db0794c9c2 100644
--- a/Code/Mantid/MantidQt/API/src/TextPropertyWidget.cpp
+++ b/Code/Mantid/MantidQt/API/src/TextPropertyWidget.cpp
@@ -58,7 +58,7 @@ namespace API
   /** Set the value into the GUI
    *
    * @param value :: string representation of the value */
-  void TextPropertyWidget::setValue(const QString & value)
+  void TextPropertyWidget::setValueImpl(const QString & value)
   {
     QString temp = value;
     if (temp.isEmpty() && !m_prop->isDefault())