problem in Terminate Application - C

Hi

I launch application with Following cocoa API.

NSString *appPath;
//i initialize appPath with my application path

NSWorkspace *defaultWorkspace;
defaultWorkspace = [NSWorkspace sharedWorkspace];

[defaultWorkspace launchApplication:appPath];

i have following problem ::
->i want to launch application in minimize mode...but it's not done
with above code..
->How can i terminate launched application ?

Is there any cocoa class to launch application in minimized and after
some time to terminate it ?

p2