Key Polling class
From the site:
Games often need to get the current state of various keys in order to respond to user input. This is not the same as responding to key down and key up events, but is rather a case of discovering if a particular key is currently pressed.
In Actionscript 2 this was a simple matter of calling Key.isDown() with the appropriate key code. But in Actionscript 3 Key.isDown no longer exists and the only intrinsic way to react to the keyboard is via the key up and key down events.
To rectify this we have created the KeyPoll class, which has isDown and isUp methods, each taking a key code as a parameter and returning a Boolean. Using the class looks like this.
http://flashgamecode.net/free/key-polling-class
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