The classes in this file are now deprecated, and have been replaced by a mixed push/pull model implemented in VBA.
It is included for the benefit of code written with earlier versions (4.2.5 and below) of XLL+.
xlppush.h contains classes and definitions for updating Excel spreadsheets asynchronously, using a 'push' model.
For more information about the push model, see Multi-threaded add-ins in the User Guide.
Most of the functionality of the model is available via the CXllPushApp class, from which your application class should be descended.