Messages, 499
  discarded by Intuition, 113
  emergency, 220
  Examples - skeleton of waiting for a signal, 434
  GetMsg(), 434
  getting, 505
  IDCMP, 90
  interprocess communication, 433
  mouse, 268
  putting, 503
  queue limits, 113
  replying, 505
  waiting for, 504
  waiting for messages and signals, 435