[iPhone] Darkening the screen like in an alert manually

Hi,
Is it possible to darken the screen manually? When an alert screen pops up, the background has a neat fade effect. Is it possible to use this effect without the alert screen?
Thanks for any help!

You can just use a basic animation to dim the screen by changing the view's alpha value. Although the alert pop-up does a glow around the alert.
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:.4];
view.alpha = .75;
[UIView commitAnimations];
http://developer.apple.com/iphone/library/documentation/iPhone/Conceptual/iPhone OSProgrammingGuide/index.html
http://developer.apple.com/documentation/Cocoa/Conceptual/CoreAnimation_guide/In troduction/Introduction.html

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[iPhone] Darkening the screen like in an alert manually

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