Type
  HKEY = THandle;
  PHKEY = ^HKEY;
  
{$ifdef windows}

{ Direct mapping to constants in Windows unit }

Const
  HKEY_CLASSES_ROOT     = Windows.HKEY_CLASSES_ROOT;
  HKEY_CURRENT_USER     = Windows.HKEY_CURRENT_USER;
  HKEY_LOCAL_MACHINE    = Windows.HKEY_LOCAL_MACHINE;
  HKEY_USERS            = Windows.HKEY_USERS;
  HKEY_PERFORMANCE_DATA = Windows.HKEY_PERFORMANCE_DATA;
  HKEY_CURRENT_CONFIG   = Windows.HKEY_CURRENT_CONFIG;
  HKEY_DYN_DATA         = Windows.HKEY_DYN_DATA;

  KEY_ALL_ACCESS         = Windows.KEY_ALL_ACCESS;
  KEY_CREATE_LINK        = Windows.KEY_CREATE_LINK;
  KEY_CREATE_SUB_KEY     = Windows.KEY_CREATE_SUB_KEY;
  KEY_ENUMERATE_SUB_KEYS = Windows.KEY_ENUMERATE_SUB_KEYS;
  KEY_EXECUTE            = Windows.KEY_EXECUTE;
  KEY_NOTIFY             = Windows.KEY_NOTIFY;
  KEY_QUERY_VALUE        = Windows.KEY_QUERY_VALUE;
  KEY_READ               = Windows.KEY_READ;
  KEY_SET_VALUE          = Windows.KEY_SET_VALUE;
  KEY_WRITE              = Windows.KEY_WRITE;

{$else}

Const
  HKEY_CLASSES_ROOT     = HKEY($80000000);
  HKEY_CURRENT_USER     = HKEY($80000001);
  HKEY_LOCAL_MACHINE    = HKEY($80000002);
  HKEY_USERS            = HKEY($80000003);
  HKEY_PERFORMANCE_DATA = HKEY($80000004);
  HKEY_CURRENT_CONFIG   = HKEY($80000005);
  HKEY_DYN_DATA         = HKEY($80000006);

  KEY_ALL_ACCESS         = $F003F;
  KEY_CREATE_LINK        = 32;
  KEY_CREATE_SUB_KEY     = 4;
  KEY_ENUMERATE_SUB_KEYS = 8;
  KEY_EXECUTE            = $20019;
  KEY_NOTIFY             = 16;
  KEY_QUERY_VALUE        = 1;
  KEY_READ               = $20019;
  KEY_SET_VALUE          = 2;
  KEY_WRITE              = $20006;
  
{$endif windows}