Hmm, just noticed today that the Singapore Ministry of Defence is exploring using Fedora Core in it's operations.
That gives me the impression that Red Hat Linux is becoming prevalent in Singapore, as some ISPs in Singapore are using Red Hat also.
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