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The "Client" version of the operating system is simply what runs on your average desktop or laptop computer which isn't providing services to other computers or users. I've been working with and supporting Macs since OS 7, and have developed skills and techniques to troubleshoot every version since then.

Nowadays there's not much call for "Classic" support now that just about everybody uses OS X, but I'm pleased to say that skills and tools remain with me just the same.