My mind was mostly geared towards users statically describing a thread ahead of
time ("This thread is associated with this name and accepts messages of this
type and reacts to a message of this one type with this handler proc" etc.)
which I then use to pass messages through threading channels from a given sender
thread to that pre-defined other thread etc.
Any thread can send any other thread a message and actor threads should be
"resting" if they have no message to work through (and possibly do some async
work)