//////////////////////////////////////////////////////////////////////////////
// MFC Tip #1 -- Vision X Software -- http://www.visionx.com/mfcpro
// Avoiding a second instance by activating the current instance
//
// This source code is provided for instructional purposes, and is released
// to the public domain. No claim of ownership is made. Use it at your own
// risk. No warranties are expressed or implied. The resulting program may
// not be fully functional. No animals were used to test this code.
//////////////////////////////////////////////////////////////////////////////

HWND hwnd = ::FindWindow(NULL, "title of your app");
if (hwnd)
{
    ::ShowWindow(hwnd, SW_SHOWDEFAULT);
    ::BringWindowToTop(hwnd);
}
return FALSE;