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Convert Classic Applications to Use Carbon

If you have a classic application—that is, an application designed for versions of the Mac OS earlier than Mac OS X—you should convert your code to use Carbon. Carbon is a set of programming interfaces that allows applications (including those originally designed for Mac OS 8 and 9) to run natively in Mac OS X. If an application uses older Mac OS APIs that aren’t part of Carbon, it cannot run reliably in Mac OS X, except in Classic (or emulation) mode.

The amount of effort required to convert a project to Carbon depends on its complexity and on the programming tactics and Mac OS APIs it uses. For full information, see Carbon Porting Guide.

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