Targeting function

[curry]

I have an alien shooting at the player in a game, and I want to let 
the alien anticipate where the player is going to be. What's the best 
method for finding this?

The input could be gun location, bullet speed, target location, 
target direction, and target speed. The output could be bullet 
direction or collision point.

I also know this that this type of targeting is a frequent feature in 
games, so I assume there should be some snippets around in books or 
the internet, but I haven't turned up anything so far.

Thanks,

Curry Kenworthy