Beginning in Mac OS X v10.5, most Mac OS X APIs are available to 64-bit applications. Going forward, Apple plans to make new APIs 64-bit-compatible unless otherwise noted. However, not all existing 32-bit APIs are supported in 64-bit applications.
This chapter includes a brief summary of these API changes and limitations and includes pointers to other documentation that provides more detailed coverage for specific technology areas.
High-Level API Changes at a Glance
Technology Area Changes at a Glance
Last updated: 2008-04-08