For it to be

[limelect]

For it to be more usable, those functions should be public to your decision
Also start should be after loading dir/files
I know it is only a concept.
I have many programs, and this one is one of them

monitoring_directory_changes.ZIP

ChngNtfy_Project.zip

procedure Start;
procedure Stop;
// IFileSystemMonitor implementation
function GetBufferSize: Integer;
procedure SetBufferSize(const BufferSize: Integer);
function AddDirectory(const Directory: string; WatchSubtree: Boolean;
  OnChange: TMonitorChangeHandler; NotifyFlags: TNotifyFlags = DefaultNotifyFlags): Boolean;
function AddFile(const FilePath: string; OnChange: TMonitorChangeHandler;
  NotifyFlags: TNotifyFlags = DefaultNotifyFlags): Boolean;
function RemoveDirectory(const Directory: string; OnChange: TMonitorChangeHandler): Boolean;
function RemoveFile(const FilePath: string; OnChange: TMonitorChangeHandler): Boolean;
function IsMonitoring: Boolean;