The latest line of HP Calculators (HP 49+ and HP50G) are powered by an ARM processor. Under normal use, these devices are running an emulator, which provides an environment based on the 4-bit extinct CPU named Saturn. The user can't harness the speed and computing power of the ARM CPU directly, until HPGCC3 libraries are installed on the calculator.
Once installed, your calculator will continue to function normally, but it will have the ability to execute native ARM programs written and compiled using HPGCC3. The libraries also provide access to the underlaying objects and variables within the Saturn emulated machine.
We hope you'll enjoy giving your calculator that extra edge.