IDCMP, 31, 247
  application allocated, 249
  Boopsi, 301
  creation, 249
  definition, 90
  discard messages, 113
  Flags, 257
  freeing, 249
  in easy requesters, 215
  input events, 249
  message structure, 250
  queue limits, 113
  requester, 210
  shared, 253-254
  WA_IDCMP tag, 107