/// <summary>
 /// Remove the given listener.
 /// </summary>
 /// <param name="listener"></param>
 /// <returns> Whether the listener was removed. </returns>
 public static bool RemoveCoreListener(IManagementListener listener)
 {
     if (instance != null) // Ensure the instance exists
     {
         return(instance.RemoveListener(listener));
     }
     else // Instance doesn't exist, cannot remove listener
     {
         return(false);
     }
 }
 /// <summary>
 /// Remove the given listener.
 /// </summary>
 /// <param name="listener"></param>
 /// <returns> Whether the listener was removed. </returns>
 public bool RemoveListener(IManagementListener listener)
 {
     return(listeners.Remove(listener));
 }
 /// <summary>
 /// Add the given listener.
 /// </summary>
 /// <param name="listener"></param>
 /// <returns> Whether the listener was added. </returns>
 public bool AddListener(IManagementListener listener)
 {
     return(listeners.Add(listener));
 }