Here are a few pics demonstrating the shooting sling in action, shamelessly stolen from Google (the 3rd pic being Keith):

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Here's another Google pic of the "hasty sling", which works quite well in a pinch, and can be used with any properly adjusted carrying strap.

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While not as steady as a full on military sling setup, the hasty sling is ultra fast to get into, and is a great choice when a quick shot presents itself.

Note that a sling can be utilized standing, sitting, kneeling, or prone, and really helps to steady oneself when a rest is not available, or time is of the essence.

Once read up on and practiced correctly, a person would be surprised how incredibly steady they can be with a sling.