One of the differences between Surface Pro and Surface RT is the addition of the stylus. Every new Surface Pro comes with a stylus. Microsoft includes the stylus so it can be used in work environments to be creative and share ideas. The only problem with this is it doesn’t work in all applications, which is a real killer for the feature. it doesn’t work in applications like Photoshop, which would be perfect for a stylus. ZDNet brought this up and received the following response from Microsoft.
Surface Pro uses Windows Inbox Drivers and APIs (application programming interfaces) for the Surface pen, which support advanced features such as pressure sensitivity and eraser functionality. There are a number of apps in the Store that leverage these new Windows APIs and can take advantage of all that the Surface pen has to offer. The Surface pen does work with Photoshop, which runs on Surface Pro, though advanced features such as pressure sensitivity and eraser functionality may not be available at this time. Microsoft is working with the necessary partners to make advanced features of the Surface pen available across a number of applications in the near future.
So it’s just a matter of developers adopting new APIs for Windows 8. We can only hope that Microsoft will help get these fixes soon. Application support has been an issue with recent new products from Microsoft, so we’d hate to see the same thing happen to Surface Pro. People want this tablet so they can get work done and be creative on the go. If the stylus only works with Windows Store apps the goal of Surface Pro has not been met.