DCOM does have security in mind, it use RPC security model, but working on COM security is a bloody process for new commers, you may want to reference <<Programming Windows Security>> by COM security guru, Keith Brown. This is definitely the best COM security book.DCOM is not scalable in internet, one problem is DCOM elect using dynamic port for resolving each object reference, this approach will be blocked by most of the firewallls, CORBA faces the same problem too.one solution is using COM Internet Service, but it may take several weeks before doing things right
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