Microsoft recently released Windows NT 4.0 Service Pack 3 (SP3), which includes more than 180 fixes for known problems. After examining SP3, I call it Security Pack 3, because it adds five strong new security features to NT, including a neat password-filtering tool for enhancing overall security. (This password filtering tool, passfilt.dll, first came with SP2, but almost no one knew it was there. I want to make sure everybody knows about this tool now that it's also in SP3.) The five securi...