Store passwords , accounts, IPs, hostnames

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http://www.unix.com – Hi, this question is not specially unix related, but I expect advanced and expert unix users to have a solution for this, and I've found no other subforum that fits ;) what do you use to store accounts, customer ids, ip addresses, users and specially passwords, to access them from everywhere different customer passwords as well as private ones any safe tool for this? do you carry them around on a encrypted usb stick or use an web application an a root server? I want to know how other admins/consultants/specialists handle this, because I need to find an easier way, my ()