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COPYDATASTRUCT myCopyDATA;
myCopyDATA.cbData=1;
myCopyDATA.lpData="1";
HWND hwnd=::FindWindow(NULL,"Receive.exe");
if (hwnd)
::SendMessage(hwnd,WM_COPYDATA,NULL,(LPARAM)&myCopyDATA);
UINT WM_Copy=RegisterWindowMessageA("WM_COPYDATA");
ON_REGISTERED_MESSAGE(WM_COPYDATA,OnMyMessage);
int OnMyMessage(WPARAM wParam, LPARAM lParam)
{
return 1;
}