> In the presence of an adequate abstraction model, an application > should not care whether a given host has one address or a dozen, > nor about whether such addresses were equivalent or different, > nor about whether they represent physically separate interfaces. there are lots of assumptions behind this about what an "address" is, how it gets used, when and where the address-to-host binding takes place and whether it can change, etc. that are sufficiently different than the current IP world that I can't tell what you are assuming.