SetForegroundWindows has some remarks usage, which could be found here:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms633539%28v=vs.85%29.aspx
At least one of the following must be true:
The process is the foreground process.
The process was started by the foreground process.
The process received the last input event.
There is no foreground process.
The foreground process is being debugged.
The foreground is not locked.
The foreground lock time-out has expired (see SPI_GETFOREGROUNDLOCKTIMEOUT in SystemParametersInfo).
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