Hardware flags are specific to the hardware and indicate the hardware's capabilities.
| Constant | Description | Value |
|---|---|---|
| HW_BIOS | Indicates the hardware uses a BIOS interface to communicate with the tablet. | 0x00200000 |
| HW_BUFFERZONE | If set, the driver creates a small zone around the tablet. | 0x00020000 |
| HW_CALIBRATE | If set, the tablet uses the calibration structure to calibrate all in-range pen input. | 0x00010000 |
| HW_PUSHMODEL | Instructs the virtual pen driver to report interrupt-time information to the pen driver for every pen packet that is gathered. | 0x00040000 |
| HW_SERIAL | Indicates the hardware is connected to a serial port. The virtual driver behaves as a serial device. | 0x00100000 |
| HW_TIMERMODEL | Instructs the virtual pen driver to report interrupt-time information to the pen driver when a timer tick occurs from the system timer instead of each time a pen packet is gathered. This can be used to reduce the number of ring transitions from the virtual pen driver to the pen driver. | 0x00080000 |