Microsoft pen protocol
The Microsoft Pen Protocol (MPP) is an active-pen communication protocol developed by Microsoft for digital pen input on Microsoft Surface and other Windows devices. The protocol covers how a powered stylus exchanges position, pressure, tilt, button and battery information with a paired digitizer using the Human Interface Device (HID) framework, and is used by the Surface Pen and Surface Slim Pen families as well as third-party pens and computers from manufacturers such as HP and Dell that license the technology.