ZwAlpcSendWaitReceivePort

INT64 __stdcall ZwAlpcSendWaitReceivePort(){
  INT64 result; 
  _disable();
  __readeflags();
  KiServiceInternal();
  return result;
}

Referenced by:

DbgkpSendErrorMessage
PopMonitorProcessLoop
PopUmpoProcessMessages
PopUmpoSendPowerMessage