Why it is not replaced by COM, how it works, network DDE, links to other sources of information. DDE is support is being removed from Windows (Windows 7 x64 seems to have an issue with it)
"Only one third of a search engine is devoted to fulfilling search requests. The other two thirds are divided between crawling (sending a host of single-minded digital organisms out to gather information) and indexing (building data structures from the results)." By George Dyson
...you should be cautious about including C hackers in your projects, as they are often the ones who have the most trouble adapting to the abstraction-based form of software development that object technology embodies... Bertrand Meyer
Our society is organized around a scarcity economy to such an extent that many people believe 'scarcity' and 'economy' mean the same thing. Even if it were true, different economies deal with differently scarce things.