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Mutex : THandle;
Mutex := CreateMutex(nil, True, 'UNIQUE_MUTEX_STRING_4_MY_APP');
bAppRunning:= (Mutex = 0) OR (GetLastError = ERROR_ALREADY_EXISTS);
if not bAppRunning then
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StreamData := TFileStream.create('chapters.cds',
fmOpenReadWrite or fmShareExclusive);
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