Answer / mano

Worker threads are used to process in back and can not
modify any user interface directly.
Ex: Used to calculate some complicated calculations.

UI threads can change user interface directly
Ex: Used to change UI display images in windows MFC application

Answer / shakuntala

User-interface threads are commonly used to handle user input and respond to events and messages generated by the user. Worker threads are commonly used to complete tasks, such as recalculation, that do not require user input.
The Win32 API does not distinguish between types of threads; it just needs to know the thread's starting address so it can begin to execute the thread. MFC handles user-interface threads specially by supplying a message pump for events in the user interface. CWinApp is an example of a user-interface thread object, because it derives from CWinThread and handles events and messages generated by the user.

Answer / muhammad iqbal nayyar

User Interface Thread has its on message pump.
   it can implement Message Map and Message handler...

Worker Thread does not have its own message pump.
  worker Thread just work on given function

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