System global variable in win32

class CSessionGlobalBool  
{
public:
 explicit CSessionGlobalBool(LPCSTR pName) {
  m_pName = (LPSTR)LocalAlloc(LMEM_FIXED, lstrlenA(pName)+sizeof(char));
  lstrcpy(m_pName, pName);
 }
 ~CSessionGlobalBool(){
  LocalFree(m_pName);
 }

 operator bool() {
  return get();
 }

 operator =(const bool b) {
  HANDLE h = CreateEvent(NULL,
   TRUE,
   FALSE,
   m_pName);

  if(b)
   SetEvent(h);
  else
   ResetEvent(h);
 }
 operator =(const CSessionGlobalBool& sgb) {
  *this = sgb.get();
 }
private:
 bool get() const {
  HANDLE h = CreateEvent(NULL,
   TRUE,
   FALSE,
   m_pName);

  return WaitForSingleObject(h, 0) == WAIT_OBJECT_0;
 }
 LPSTR m_pName;
};

I’m using a manual-set event object. In fact this is not a system global variable but session global which each user have until she/he logged out.

The bool value read from this object is volatile, even the comparison of the same object could become false.