在一些碰到過的多媒體軟件編制過程中通常需要徹底屏蔽任務條，通常的辦法是調用ShowWindow(h,SW_hide)來隱藏任務條，但是不能屏蔽開始菜單，通過鍵盤的win功能鍵還是可以打開開始菜單，所以配合鍵盤鉤子，來屏蔽開始菜單。

{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your   Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }

uses
  SysUtils,
  Classes,
  windows,
  messages;

var
hHk :HHOOK;
type
  PKBDLLHOOKSTRUCT = ^KBDLLHOOKSTRUCT;
  KBDLLHOOKSTRUCT = record
    vkCode: DWord;
    ScanCode: DWORD;
    Flags: DWORD;
    Time: DWORD;
    dwExtraInfo: DWORD;
  end;
{$R *.res}
function ycxsks( yc:Boolean): Boolean;stdcall; //隱藏-顯示任務條
var
h:THandle;
begin
if yc = True then
  begin
    h:=FindWindow('Shell_TrayWnd',nil);
    ShowWindow(h,SW_hide); //隱藏任務條
  end
else
  begin
    h:=FindWindow('Shell_TrayWnd',nil);
    ShowWindow(h,SW_SHOW); //顯示任務條
  end;
Result:=true;
end;

function keyHookProc(nCode: Integer;WParam: WPARAM;LParam: LPARAM): LRESULT;stdcall;
//調用鍵盤鉤子，屏蔽左右win功能鍵
var
p: PKBDLLHOOKSTRUCT;
y: integer;
begin
if nCode<0 then
  Result:= CallNextHookEx(hHk,nCode,WParam,LParam)
else
  begin
    y := 0;
    case WParam of
    WM_KEYDOWN,WM_SYSKEYDOWN: //按鍵后判斷所按鍵
      begin
        p:=PKBDLLHOOKSTRUCT(Lparam); 
        if p^.vkCode = VK_LWIN then
          y := 1;
        if p^.vkCode = VK_RWIN then
          y := 1;
      end;
    WM_KEYUP,WM_SYSKEYUP: //松開按鍵后判斷所按鍵
      begin
        p:=PKBDLLHOOKSTRUCT(Lparam);
        if p^.vkCode = VK_LWIN then
          y := 1;
        if p^.vkCode = VK_RWIN then
          y := 1;
      end;
    end;
    if y=1 then
      Result:=1 //如果為WIN功能鍵則屏蔽
    else
      Result:= CallNextHookEx(hHk,nCode,WParam,LParam); //其他鍵放下一個鉤子
  end
end;

function Enablehide:Boolean;stdcall;export; //外部調用
begin
if hHk = 0 then
  begin
    hHk := SetWindowsHookEx(13,@keyHookProc,HInstance,0);
    Result := True;
  end
else
  Result := False;
ycxsks(true);
end;

function Disablehide:Boolean; stdcall; export; //外部調用
begin
if hHk <> 0 then
  begin
    UnHookWindowsHookEx(hHk);
    hHk := 0;
    Result := True;
  end
else
  Result := False;
ycxsks(False);
end;

exports
Enablehide,
Disablehide;
end.