I have heard some positive opinions about Windows Workflow Foundation, so decided to get a book, and find out what's this all about on my own. Found this article about “Essential Windows Workflow Foundation” book by Dharma Shukla and Bob Schmidt - the actual architects of this technology - including a free chapter 3 “Activity Execution”. The book starts from the variation of the cannonical "Hello, World" C# program called "Open, Sesame". In Delphi it might look like this: program OpenSesame;...