Structure of Mac OS "Classic"
"Classic" means any version of Mac OS prior to X - i.e. Mac OS 1.0 through 9.1.
- "Cooperative" multitasking
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Most operations done through the Toolbox
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OS itself basically consists of the Finder
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"Extensions" loaded during bootup
Neither ITS nor Apple support Mac OS Classic any more, so you don't have to answer technical questions about it if you don't feel comfortable doing so.