>  #3: There are threads in SmallTalk. Are these threads mapped 
>  to threads of the operation system or are SmallTalk threads
>  something completely different?

It depends on the Smalltalk. In Squeak, VisualWorks, ... they are 
not mapped, Smalltalk/MT and Smallscript on the other side use
native threads. 

The last two and Dolphin Smalltalk are also able to deliver 
applications just as an executable (the exe contains the image)

You can do this with squeak as well but you need some more
knowledge - an example is Embedded Squeak
(http://www.kurtz-fernhout.com/squeak/).

Bye
Torsten