An OPC redirection manager maintains the information necessary for taking
appropriate action when the target OPC server fails and for ensuring that
no bad status is returned to the client. Any existing OPC client needing
seamless failover between target OPC data access and/or alarm and event
servers will connect to a uniquely configured instance of the redirection
manager instead of connecting to the primary server. The client
application continues to perform OPC related tasks as usual. Because each
client connection is unique, the redirection manager itself is not a
single point of failure. Each configured redirection manager instance
monitors the health of the target server mode and the target server
itself by subscribing to failure events.