I dont understand how these code works here :

          m_MouseHookManager.MouseDoubleClick+=HookManager_MouseDoubleClick;
          m_MouseHookManager.MouseDoubleClick -= HookManager_MouseDoubleClick;
          m_KeyboardHookManager.KeyPress +=HookManager_KeyPress;
          m_KeyboardHookManager.KeyPress -=HookManager_KeyPress;

My full Code is here :

   using System;
    using System.Windows.Forms;
    using MouseKeyboardActivityMonitor.WinApi;

 namespace MouseKeyboardActivityMonitor.Demo
  {
 public partial class TestFormHookListeners : Form
{
    private readonly KeyboardHookListener m_KeyboardHookManager;
    private readonly MouseHookListener m_MouseHookManager;

    public TestFormHookListeners()
    {
        InitializeComponent();
        m_KeyboardHookManager = new KeyboardHookListener(new GlobalHooker());
        // Hooks are not active after instantiation. You need to use either Enabled property or call Start()()()() method
        m_KeyboardHookManager.Enabled = true;//True - The Hook is presently installed, activated, and will fire events.

        m_MouseHookManager = new MouseHookListener(new GlobalHooker());
       m_MouseHookManager.Enabled = true;
    }

    #region Check boxes to set or remove particular event handlers.

    private void checkBoxMouseDoubleClick_CheckedChanged(object sender, EventArgs e)
    {
        if (checkBoxMouseDoubleClick.Checked)
        {
            m_MouseHookManager.MouseDoubleClick += HookManager_MouseDoubleClick;
        }
        else
        {
            m_MouseHookManager.MouseDoubleClick -= HookManager_MouseDoubleClick;
       }
    }



   private void checkBoxKeyPress_CheckedChanged(object sender, EventArgs e)
   {
       if (checkBoxKeyPress.Checked)
        {
            m_KeyboardHookManager.KeyPress +=HookManager_KeyPress;
        }
        else
        {
            m_KeyboardHookManager.KeyPress -=HookManager_KeyPress;
        }
    }

    #endregion

    #region Event handlers of particular events. They will be activated when an appropriate checkbox is checked.


    private void HookManager_KeyPress(object sender, KeyPressEventArgs e)
    {
        Log(string.Format("KeyPress \t\t {0}\n", e.KeyChar));

    }


    private void HookManager_MouseDoubleClick(object sender, MouseEventArgs e)
    {
        Log(string.Format("MouseDoubleClick \t\t {0}\n", e.Button));

    }


    private void Log(string text)
    {
        textBoxLog.AppendText(text);
        textBoxLog.ScrollToCaret();
    }

    #endregion

    private void checkBoxEnabled_CheckedChanged(object sender, EventArgs e)
    {
        m_MouseHookManager.Enabled = checkBoxEnabled.Checked;
        m_KeyboardHookManager.Enabled = checkBoxEnabled.Checked;
    }

    private void radioHooksType_CheckedChanged(object sender, EventArgs e)
    {
        Hooker hook;

        if (radioApplication.Checked)
        {
            hook = new AppHooker();//Provides methods for subscription and unsubscription to application mouse and keyboard hooks. 

        }
        else
        {
            hook = new GlobalHooker();//Provides methods for subscription and unsubscription to global mouse and keyboard hooks. 

        }

        m_KeyboardHookManager.Replace(hook);
        m_MouseHookManager.Replace(hook);//hook->An AppHooker or GlobalHooker object.

        //Enables you to switch from application hooks to global hooks 
        //and vice versa on the fly without unsubscribing from events.
        //Component remains enabled or disabled state after this call as it was before. 
        //Declaration Syntax
    }

      private void HookManager_Supress(object sender, MouseEventExtArgs e)
     {
         if (e.Button != MouseButtons.Right) { return; }
        Log("Suppressed.\n");
       e.Handled = true;
    }
}

}

Can anybody help to understand that??? I want by this that whenever a F5 key-pressed my application will be active and then it checks if double-click happen it gives a message .... **How can i modify that.....??????**