Answer Posted / sreekanth

A: You need to create a named mutex semaphore when you
start your application. When the second one starts it tries
to get access to the mutex but will fail...


Code:
// app.h
class CYourApp : public CWinApp
{
...

private:
HANDLE hMutex;
};

// app.cpp
BOOL CYourApp::InitInstance()
{
// Create mutex
hMutex = ::CreateMutex(NULL, TRUE, "GlobalMutex");

switch(::GetLastError())
{
case ERROR_SUCCESS:
// Mutex created successfully. There is no instance
running
break;

case ERROR_ALREADY_EXISTS:
// Mutex already exists so there is a running
instance of our app.
return FALSE;

default:
// Failed to create mutex by unknown reason
return FALSE;
}
}

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