Tribad

If I had 100k EUR I would complete my game-engine, that I am working right now but get disturbed a lot of times to earn the money for living.

As a sample application I would complete a small browsergame and continue to the next iteration of the engine.

This way I can complete, at some time far away in the future, the engine and have designed some tiny games to check if all is working as expected.

Yeah. About a 100k would be enough to have 2 more years of development for me alone. There are some graphics/web designers needed as well.

While your server is listening on a specific port no other can do that and same thing around. If some other server process is already listening to  a port you want to use you get an error saying something like "address already in use"

There is some kind of database available that can be querried for system defined ports and for what kind of service they are normaly used. But this is a different functionality.

This database is used to make applications idependent from fixed port numbers.

Create a base class with the doStuff() and doMoreStuff() methods defined as virtual.

Whereever you think to need these methods mix-in this baseclass and define a specific method doStuff() and doMoreStuff().

But anyways you need someone who is going through all that doStuff thing.

I'm not sure I understand your question, but I can see that when the you try to call MuckAround() on a Goblin object it would crash at runtime because the Humanoid class doesn't define that function - is this what you were wondering?

This code will not compile.

Because MuckAround is not defined in Humanoid. So you cant call it on the base class.

I think someone will check the value whether it is true or false. If it is done in a loop and it has no harm to  check it a cycle later it is seems to me ok to not do any synchronization.