/* $DOC$
   $NAME$
      ft_Peek()
   $CATEGORY$
      DOS/BIOS
   $ONELINER$
      Retrieve a byte from a specified memory location.
   $SYNTAX$
      ft_Peek( <nSegment>, <nOffset> ) -> nValue
   $ARGUMENTS$
      <nSegment> is the segment of the desired memory address.

      <nOffset>  is the offset of the desired memory address.
   $RETURNS$
      <nValue> will be a value from 0 to 255 if all parameters were valid and
               the function was able to retrieve the desired byte.
      <nValue> will be -1 if invalid parameters were passed.
   $DESCRIPTION$
      Use this function if you have a need to examine a specific memory
      location.  The function will return the byte at the specified
      address as a numeric value.  If you need this value as a character,
      use the hb_BChar() function to convert it.
   $EXAMPLES$
      ? ft_Peek( 0, 0x449 )  // Get the current video mode (MS-DOS)
   $END$
 */