active passive in memory object redundancy .NET -

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i have following requirement don't know way begin with. have application when started creates object in memory. have start same application on other machine , other machine should create same object in memory. now, if can or set data to/from object third machine (client). 2 machines must keep in-memory object in sync such if client updates object in 1 machine should updated in second machine well. client should able register notifications such if important happens, server should notify client. if 1 machine gets down client's request should start going other machine. client should not have register notifications second time. in short want active/passive kind of redundancy @ in memory object level notification features. in c++, used applibus (a customized corba middleware), in .net have no clue. need use middle ware or cluster/nlb configuration or hardware redundancy of server. please help


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