TaskKeyMgr.h

////////////////////////////////////////////////////////////////
// MSDN Magazine — September 2002
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
// Compiles with Visual Studio 6.0 and Visual Studio .NET on Windows XP.
//
#pragma once
#include "TaskKeyHook.h"

//////////////////
// Use this class to disable task keys, task manager and/or the taskbar.
// Call Disable with flags for items you want to disable; for example:
//
// CTaskMgrKeys::Disable(CTaskMgrKeys::ALL);
// 
class CTaskKeyMgr {
public:
   enum {
      TASKMGR  = 0x01,  // disable task manager (Ctrl+Alt+Del)
      TASKKEYS = 0x02,  // disable task keys (Alt-TAB, etc)
      TASKBAR  = 0x04,  // disable task bar
      ALL=0xFFFF        // disable everything :(
   };
   static void Disable(DWORD dwItem,BOOL bDisable,BOOL bBeep=FALSE);

   static BOOL IsTaskMgrDisabled();
   static BOOL IsTaskBarDisabled();
   static BOOL AreTaskKeysDisabled() {
      return ::AreTaskKeysDisabled(); // call DLL 
   }
};

TaskKeyMgr.cpp

////////////////////////////////////////////////////////////////
// MSDN Magazine — September 2002
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
// Compiles with Visual Studio 6.0 and Visual Studio .NET on Windows XP.
//
#include "StdAfx.h"
#include "TaskKeyMgr.h"

#define HKCU HKEY_CURRENT_USER

// Magic registry key/value for "Remove Task Manager" policy.
LPCTSTR KEY_DisableTaskMgr =
   "Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System";
LPCTSTR VAL_DisableTaskMgr = "DisableTaskMgr";

//////////////////
// Disable task-key related stuff.
// 
// dwFlags  = what to disable
// bDisable = disable (TRUE) or enable (FALSE)
// bBeep    = whether to beep for illegal keys (TASKKEYS only)
//
void CTaskKeyMgr::Disable(DWORD dwFlags, BOOL bDisable, BOOL bBeep)
{
   // task manager (Ctrl+Alt+Del)
   if (dwFlags & TASKMGR) {
      HKEY hk;
      if (RegOpenKey(HKCU, KEY_DisableTaskMgr,&hk)!=ERROR_SUCCESS)
         RegCreateKey(HKCU, KEY_DisableTaskMgr, &hk);

      if (bDisable) { // disable TM: set policy = 1
         DWORD val=1;
         RegSetValueEx(hk, VAL_DisableTaskMgr, NULL,
            REG_DWORD, (BYTE*)&val, sizeof(val));

      } else { // enable TM: remove policy 
         RegDeleteValue(hk,VAL_DisableTaskMgr);
      }
   }

   // task keys (Alt-TAB etc)
   if (dwFlags & TASKKEYS)
      ::DisableTaskKeys(bDisable,bBeep); // install keyboard hook

   // task bar
   if (dwFlags & TASKBAR) {
      HWND hwnd = FindWindow("Shell_traywnd", NULL);
      EnableWindow(hwnd, !bDisable);
   }
}

BOOL CTaskKeyMgr::IsTaskBarDisabled()
{
   HWND hwnd = FindWindow("Shell_traywnd", NULL);
   return IsWindow(hwnd) ? !IsWindowEnabled(hwnd) : TRUE;
}

BOOL CTaskKeyMgr::IsTaskMgrDisabled()
{
   HKEY hk;
   if (RegOpenKey(HKCU, KEY_DisableTaskMgr, &hk)!=ERROR_SUCCESS)
      return FALSE; // no key ==> not disabled

   DWORD val=0;
   DWORD len=4;
   return RegQueryValueEx(hk, VAL_DisableTaskMgr,
      NULL, NULL, (BYTE*)&val, &len)==ERROR_SUCCESS && val==1;
}