Let's see one simple example showing how the methods and the languages of graphical user interface (GUI) description are progressing (or regressing, it depends) during the last 15-20 years.

The primitive form description requires:

The small test program shows how I/O operations (memory and file) can be accelerated using multiple threads.

Reflection mechanics explained with the vacuum cleaner quine. Should be usable also for explaining single level recursion.

"Programming with databases" (both printed version and Kindle e-book) is the translated and revised Second Edition of my previous book published in 2015.

Suppose that Office 2016 Pro Plus (MS ActionPack, MSDN subscription etc.) is installed on your PC but you still need to add some language support. In my case, I need to add the Russian proof tools to the English Office that includes already the French language support but doesn't contain any Cyrillic spell checking.