One of the painful limitations of WaitForMultipleObjects function is that you can use it to wait for a maximum of MAXIMUM_WAIT_OBJECTS number of object handles. Value of MAXIMUM_WAIT_OBJECTS is 64. If you need to wait on more than MAXIMUM_WAIT_OBJECTS handle, you can either create a separate thread to wait on MAXIMUM_WAIT_OBJECTS and then do a wait on these threads to finish. Using this method you can create 64 threads each of those can wait for 64 object handles.