Answer / vikram

UI thread and Worker thread can communicate with each other using SendMessage() or PostMessage().SendMessage() returns when the message is used by the Thread. PostMessage Returns immediately. These two method require Window handle of the UI Thread.

One can also use PostThreadMessage(thread id, message).here UI thread id is required.

Answer / vishnu

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

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