Multimaster Housecat is a variation of the Housecat pattern in which multiple senders send requests to a single receiver. The diagram shows this pattern, where Cat refers to the sender, and Master refers to the receiver. The Router refers to a set of feeds and pipes, or other resources capable of queuing and routing messages.
A typical use for Multimaster Housecat would be a logging process that receives messages from many sources. If the purpose is to do work and send responses, a Wolfpack + Reverse Housecat combination is more suitable.