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    SetBit()

         Activates a selected bit from a byte

    Syntax:

         SetBit ( cByte, nBitPos ) -> cNewByte

         cByte   : The byte to treat.
         nBitPos : The position of the bit inside the byte.

    Description:

         Puts to 1 a selected bit from a byte returning the new byte.

    Return:

         The new byte or Nil if cByte is not a character or nBitPos is
         not numeric.

    Example:

         cNewByte := BitBorra ( "C", 2 )