procedure TForm1.Button1Click(Sender: TObject);
begin
  PowerControl1.Action := actCDEject; // Или... actLogOFF, actShutDown...
  PowerControl1.Execute;
end;

// ========================= //
//     Component Code:       //
// ========================= //

unit PowerControl;

interface

uses
  WinTypes, WinProcs, Messages, SysUtils, Classes, Controls,
  Forms, Graphics, MMSystem;

type
  TAction = (actLogOFF, actShutDown, actReBoot, actForce, actPowerOFF,  actForceIfHung,
             actMonitorOFF, actMonitorON, actCDEject, actCDUnEject);

type
  TPowerControl = class(TComponent)
  private
    FAction: TAction;
    procedure SetAction(Value : TAction);
  protected
  public
    function Execute : Boolean;
  published
    property Action : TAction read FAction write SetAction;
end;

procedure register;

implementation

procedure register;
begin
  RegisterComponents('K2', [TPowerControl]);
end;

procedure TPowerControl.SetAction(Value: TAction);
begin
  FAction := Value;
end;

function TPowerControl.Execute: Boolean;
begin
  with (Owner as TForm) do
    case FAction of
      actLogOff: ExitWindowsEx(EWX_LOGOFF,1);
      actShutDown: ExitWindowsEx(EWX_SHUTDOWN,1);
      actReBoot: ExitWindowsEx(EWX_REBOOT,1);
      actForce: ExitWindowsEx(EWX_FORCE,1);
      actPowerOff: ExitWindowsEx(EWX_POWEROFF,1);
      actForceIfHung: ExitWindowsEx(EWX_FORCEIFHUNG,1);
      actMonitorOFF: SendMessage(Application.Handle, WM_SYSCOMMAND, SC_MONITORPOWER, 0);
      actMonitorON: SendMessage(Application.Handle, WM_SYSCOMMAND, SC_MONITORPOWER, -1);
      actCDEject: mciSendstring('SET CDAUDIO DOOR OPEN WAIT',nil,0, Handle);
      actCDUnEject: mciSendstring('SET CDAUDIO DOOR CLOSED WAIT',nil,0, Handle);
    end;
    Result := True;
end;