.. applied:: void catch_msg(mixed *|struct|mapping|object msg, object obj)

  When :efun:`say`, :efun:`tell_room` or :efun:`tell_object` are used with a non-string as message, the value will be passed to :applied:`catch_msg` in all living objects that can hear it, instead of writing to the user resp. sending to :applied:`catch_tell`. This can be used to implement communication protocols between livings. The second argument denotes the object that has sent the message.

  :history 3.2.11 changed: added :efun:`tell_object()` to the efuns calling this lfun for symmetry reasons.
  :history 3.3.686 changed: added the use of a mapping/struct/object as message value.

  .. seealso:: :efun:`say`, :efun:`tell_room`, :applied:`catch_tell`