This enumeration determines whether the scanner supports duplex.
Values:
| IG_TW_DX_1PASSDUPLEX | One duplex is supported. |
| IG_TW_DX_2PASSDUPLEX | Two duplex is supported. |
| IG_TW_DX_NONE | No duplex support. |
| ImageGear Professional DLL v17.1 for Windows |  |
| enumIGTWAINDuplex | |
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| ImageGear Professional DLL v17.1 for Windows > API Reference Guide > TWAIN Component API Reference > TWAIN Component Enumerations > enumIGTWAINDuplex |