Deadstart is support which differs per compiler, but allows applications access a C++ feature - static classes with constructors that initialize at loadtime, but, have the feature that you can create threads. Deadstart code is run after the DLL load lock under windows that prevents creation of threads; however, deadstart is run before main. Deadstart routines can have a priority. Certain features require others to be present always. This allows explicit control of priority unlink using classes with static constructors, which requires ordering of objects to provide linking order. Also provides a similar registration mechanism for atexit, but extending with priority. Deadstop registrations are done sometime during normal C atexit() handling, but may be triggered first by calling BAG_Exit. 

Registry offers support to register functions, and data under a hierarchy of names. Names are kept in a string cache, which applications can take benefit of. Strings will exist only a single time. This table could be saved, and a look-aside table for language translation purposes. Registry is the support that the latest PSI relies on for registering event callbacks for controls. The registry was always used, but, the access to it was encapsulated by DoRegisterControl registering the appropriate methods.