The Max API provides a variety of useful data structures which may be used across platforms and provide basic thread-safety.
Most often, the use of a particular instance of a data structure will be limited to within the confines a single class or object you create. However, in some cases you may wish to pass structured data from one object to another. For this purpose, Max 6 introduces facilities for passing named t_dictionary instances.
Examples, descriptions, and API documentation can be found in Dictionary Passing API .