Well, who's Blake Stone and Charles “Chuck” Jazdzewski anyway?
Blake Stone was the CTO at Borland, and the JBuilder architect. Chuck Jazdzewski was the Delphi architect.
Well, now we know where Blake Stone went. But, where's Chuck?
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes