YoYo is a small daemon process which runs on each machine on
a network. When it starts, it broadcasts a message on the
network, indicating that it is starting. Instances of YoYo
which are already running note this, and send a message
back to the new instance (indicating that they are up).
Similarly, when an instance of YoYo stops, it broadcasts
the fact on the network, so that the other instances know
about it.
Each time an instance of YoYo receives a message from some
other instance, if the state of the sender has changed, the
receiving instance executes one or more commands.
So, given machines named quaking, sandford and tiny, when
tiny comes up, quaking and sandford will both NFS mount
tiny's file system, and dismount when tiny goes down; and
similarly for quaking and sandford.
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