I don't follow why xor is useless, and and isn't. Afterall, if I'm not interested in the result, I can write

    EXPR1 and EXPR2;
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as

    if (EXPR1) {EXPR2}
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And something similar for or.

I've used xor, although not very often. A few months ago I used it in a program that took command line arguments. 2 options where multiple exclusive, but at least one of them had to be used. So I had something like:

    unless (defined ($opt1) xor defined ($opt2)) {
        die "usage message";
    }
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I don't use xor often, but I still use it more than CGI.pm ;-).

Abigail