Among a range of improvements, including an 8-megapixel camera with burst mode (instead of the Grand X's dowdy five with no burst) and 1GB of RAM (instead of 512MB), the biggest change is that processor: out goes the old NVIDIA Tegra 2 and in comes a Medfield Z2460.
Before the program stops making use of the processor, it registers its change of activity with Windows Push Notification Services (WNS) - software that runs on Microsoft's remote computer servers.
To help both virtualization and cloud environments, VMware also made a significant change to its licensing model, moving away from CPU core entitlements (VMware will still count processor sockets, though) to pooled vRAM entitlements.