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how to recognize the backspace character?

I am trying to read a backspace character using read-char but it doesn't work.

The situation:

         ? (read-char) 
           a             ;; was given: a

         ? (read-char)
                         ;; was given : hit the space bar

The problem:
         ? (read-char)
                         ;; was given : hit the backspace 
 The reader still wait for an input and ignores the backspace.
May anybody tell me what's wrong ?

Thanks in advance.