Well, if you do an XOR of two strings (scalars that
haven't been used as numbers), perl will do a bitwise
XOR on the characters of the strings, instead of the
bits on the numbers. Two characters that are the same
will have all the bits the same, XORing those characters
will give you the character of which all the bits are 0,
aka "\x00". If two characters are not the same, there is
at least one bitpositions where the bits are different -
resulting in a 1 bit when XORing. Hence, the resulting
character will be anything but "\x00".
Abigail
