This is an MFC thread synchronization under the examples in which I used a vice thread (SecondApplication) to handle the dialog box message, while addressing the message, will handle the message back to the dialog box, textbox

testMultiOp\testMultiOp\testMultiOp.vcproj
...........\...........\ReadMe.txt
...........\...........\testMultiOp.h
...........\...........\stdafx.h
...........\...........\stdafx.cpp
...........\...........\res\testMultiOp.rc2
...........\...........\...\testMultiOp.ico
...........\...........\testMultiOp.vcproj.74CFC61F39AF4E3.Administrator.user
...........\...........\Resource.h
...........\...........\testMultiOp.aps
...........\...........\testMultiOp.rc
...........\...........\testMultiOpDlg.h
...........\...........\testMultiOpDlg.cpp
...........\...........\testMultiOp.cpp
...........\testMultiOp.sln
...........\testMultiOp.suo
...........\...........\res
...........\testMultiOp
testMultiOp

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