When a user presses a key on the keyboard, the device driver maps to the appropriate scan code. To process the translation of the scan code to a Unicode character or virtual function key, a set of ULS keyboard functions are provided.

The keyboard functions maintain a state that includes information about:

• Shift state
  
• Lock state
  
• Virtual and dead key

The keyboard functions include:

• Translation table manipulation functions:
  UniCreateKeyboard
  Load a keyboard layout
  UniDestroyKeyboard
  Unload a keyboard layout
  UniQueryKeyboard
  Query information from the header in the keyboard table layout
  2.
  Translation and state maintenance functions: UniResetShiftState
  Reset the shift state and LED status
  UniTranslateDeadKey
  Translate a dead key code with a Unicode to a composite character
  UniTranslateKey
  Translate a scan code plus shift state to a Unicode and virtual or dead key
  UniUntranslateKey
  Translate a Unicode to a scan code plus shift state
  UniUpdateShiftState
  Maintain shift state and LED status

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