PATH Carbon Developer Documentation > Runtime Services> Mixed Mode Manager

The Mixed Mode Manager handles the overhead required (such as parameter and stack manipulation) to allow PowerPC code to call classic 68K code and vice versa. Although Mac OS X will not run 68K code, Carbon will support universal procedure pointers (UPPs) transparently, so you do not have to change them or remove them from your code. You may want to keep Mixed Mode Manager calls in your application to maintain compatibility with the current version of the Mac OS. Mixed Mode Manager calls from Carbon applications running on Mac OS 8 or 9 will function normally.

Mixed Mode Manager Reference This document provides a complete reference to the Mixed Mode Manager APIs.