Get the state of window opened by ShellExecute

[nbaztec]

Hi all,
I wanna know say I opened an exe using ShellExecute(), and now I wanna wait till its finished closing how can I do this.

//I can do upto here only
HWND H;
H=ShellExecute(MainWindow,"open","Dummy.exe",NULL,NULL,SW_SHOW);

//After this i dnt know what to do

[Test if H has closed] ???

Thanks,
Nisheeth