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Usage Page/Digitizer

Contact identifier

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Usage (0x51)

Contact identifier

メモ

• Specifies the identifier of the current contact. An identifier must remain constant while the contact is detected by the device. Each separate concurrent contact must have a unique identifier. Identifiers can be reused if a contact is no longer detected. If the device supports "in-air" packets (the contact is hovering above the surface), the identifier must persist from the time that the contact is detected until the time that it goes out of range.
• Windows 7
  • https://msdn.microsoft.com/en-us/library/windows/hardware/ff553734(v=vs.85).aspx

• Windows 8
  • https://msdn.microsoft.com/en-us/library/windows/hardware/dn672279(v=vs.85).aspx