What is stored in the keyboardbuffer and in which format?

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I am new to keyboards so please excuse my question. I know that

  • a keypress on the keyboard produces a scancode
  • a scancode is used to obtain a virtual key (dependant on the kbdxx.dll)
  • the virtual key + modifier key are used to get the character.

I also know that there is the keyboardbuffer. Now my question:

Inside the buffer, what is stored there - the scancode?, the keycode? or the character?

And if the character is stored in what format ( as a character, the Unicode-number,...?)

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