A method of and apparatus for communicating between a host and an agent. According to an embodiment of the invention a method for communicating data between a host and an agent is described. The method includes performing a first transaction at a first time between a host and a hub. The method then includes performing a second transaction between the hub and an agent. The method then includes performing the first transaction at a second time between the host and the hub. The second transaction is based on the first transaction for the second time.