An Introduction to Processes: Asynchronous Process Notification

class WaitInfo {
    public:
       WaitInfo() {hProcess = NULL; notifyee = NULL; }
       virtual ~WaitInfo() { }
       void requestNotification(HANDLE pr, CWnd * tell);
       static UINT UWM_PROCESS_TERMINATED;
    protected:
       HANDLE hProcess; // process handle
       CWnd * notifyee; // window to notify
       static UINT waiter(LPVOID p) { ((WaitInfo *)p)->waiter(); return 0; }
       void waiter();
};

/****************************************************************************
*                           UWM_PROCESS_TERMINATED
* Inputs:
*       WPARAM: ignored
*       LPARAM: Process handle of process
* Result: LRESULT
*       Logically void, 0, always
* Effect: 
*       Notifies the parent window that the process has been terminated
* Notes:
*       It is the responsibility of the parent window to perform a
*       ::CloseHandle operation on the handle. Otherwise there will be
*       a handle leak.
****************************************************************************/

#define UWM_PROCESS_TERMINATED_MSG _T("UWM_PROCESS_TERMINATED-{F7113F80-6D03-11d3-9FDD-006067718D04}")