In Summary
Aries was created to help existing customers move their legacy environments and applications—the native applications that they were currently running—into the new Itanium world with a minimum of disruption.
The Aries project began with three main challenges to overcome if binary compatibility was going to lead to seamless client transitions: reliability, usability, and performance.
Aries could be considered a kind of virtual microprocessor. The benchmarking and testing of the system was robust.
Since Aries is built into the current versions of HP's flavor of Unix[29] (HP-UX), the operating system automatically detects PA-RISC applications and directs them to run under the control of the Aries system with complete transparency.
[29] Unix ...
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