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void SetTransparent(HWND wnd, int percent)
{
    SLWA pSetLayeredWindowAttributes = NULL;
    HINSTANCE hmodUSER32 = LoadLibrary("USER32.DLL");  
    pSetLayeredWindowAttributes = (SLWA)GetProcAddress(hmodUSER32,"SetLayeredWindowAttributes");
    HWND hwnd = wnd;
    SetWindowLong(hwnd,GWL_EXSTYLE,GetWindowLong(hwnd,GWL_EXSTYLE) | WS_EX_LAYERED);
    //ModifyStyleEx(0, WS_EX_LAYERED);  앞이랑 같은말
   // ModifyStyleEx(0, WS_EX_TRANSPARENT | WS_EX_LAYERED); 창 통과해서 클릭가능
    pSetLayeredWindowAttributes(hwnd, 0, (255*percent/100), LWA_ALPHA);
}

핸들이랑 주고싶은 알파값 전달하면 될듯