Answer / shanmuga

Becoz,through the CWinApp object only ,the application
starts.. If there exist more than one object there occurs a
conflict to proceed with which object.

Answer / narayan

You theApp object is replace with new name;

Eg

CdlgtestApp theApp;
CdlgtestApp theApp3; // now this is your applcation obj

CdlgtestApp theApp3;
CdlgtestApp theApp; // No effect

Answer / jdp

Because the CWinApp class encapsulates the main() method
which, as you know, there can be only one instance of in
any application.

Answer / deepesh

because in constructor of CWinApp class
if it will called twice
ASSERT(AfxGetThread() == NULL);
will cause run time assertion

Answer / sirama

Because MFC implemented it as Singleton CWinApp::Ctor.

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