HID Usage Tables Document 1.1 - C. Scott Ananian

80 Universal Serial Bus HID Usage Tables15.4 Digitizer Switch UsagesTip SwitchSecondary Tip SwitchBarrel SwitchEraserTablet PickMC – A switch located at the tip of a stylus, indicating contact of the styluswith a surface. A pen-based system or system extension would use this switchto enable the input of handwriting or gesture data. The system typically mapsTip Switch to a primary button in a non-pen context.MC – A secondary switch used in conjunction with Tip Switch to indicatepressure above a certain threshold applied with the stylus. The thresholdswitch is not closed unless the tip switch already is.MC – A non-tip button located on the barrel of a stylus. Its function istypically mapped to a system secondary button or to a Shift key modifier thatchanges the Tip Switch function from primary button to secondary button.MC – This control is used for erasing objects. Following the metaphor of apencil, it is typically located opposite the writing end of a stylus. It may be abit switch or a pressure quantity.MC – The primary button used by CAD systems, typically to select an object.Sometimes called Button Zero.Version 1.1 April 8, 1999