single thread and multithread

we can use threads in our program in two ways

1) extending java.lang.Thread
2) implimenting java.lang.Runnable

 (in java)

Theading types in  Microsoft world are 
STA -Single threaded apartment model- Synchronized
automatically- E.g Forms in windows(Win forms) are STA
application.
MTA -Multithreaded apartment model -Here synchronization is
required to acess shared resources. Use Mutex or Monitors

Unmanaged code is the type of  code which will not execute 
in the CLR environment. Memory manangement,garbage 
collection,security of CLR environment do not apply to 
Ummanaged code.

COM objects contain interfaces, each of which has two 
names, a name for software to use and a name for people to 
use. The human-readable name conventionally starts with an 
I. The unique software-readable name is called a globally 
unique identifier, or GUID. Sometimes GUID is referred to 
as UUID, where the U stands for universal.

But exactly what is difference in both?

An assembly is building block of .NET framework. They form 
the fundamental unit of deployment,version control, 
security. An assembly is collection of types and resources 
which form logical unit of functionality.

Assembly is unit of deployment like exe or dll.
Assembly may contain reference to other assembly.