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Since the OpenStack Dashboard (Horizon) talks with the native API to the other OpenStack components (like Compute, Network, Identity, etc) you can't simply add an Amazon AWS account to it and control both Amazon accounts and OpenStack accounts from the same web interface. Probably you can extend Horizon to add the capability to control Amazon AWS but I'm not aware of anybody doing that.

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made the answer more explicit about horizon-aws capabilities

Since the OpenStack Dashboard (Horizon) talks with the native API to the other OpenStack components (like Compute, Network, Identity, etc) you can't simply add an Amazon AWS account to it and control both Amazon accounts and OpenStack accounts from the same web interface.

At the moment Horizon cannot be used as an interface to Amazon AWS. Probably you can extend Horizon to add the capability to control Amazon AWS but I'm not aware of anybody doing that.