They can. Both operating systems exist on the same physical disk. To switch operating systems, restart the Macintosh.
Macintosh applications can be run under the A/UX Finder: a Mac OS environment running on top of A/UX. Further, A/UX applications can be written to look like Macintosh applications if they use the A/UX Toolbox, with windows, icons, and so on.
Article Change History:
26 Apr 1995 - Made correction of typographical errors.
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