We copy them properly... your friend can create them with his Cocoa application, he just has to use Carbon to do it. That's totally normal, and easy to do.
Note, though, that a regular symlink works fine, too (not to replace an alias, of course, but as a functional equivalent in a programmatic situation that isn't trying to "clone" a drive) -- and they're used throughout the system.
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--Dave Nanian
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