Basically, this brings up a print dialogue that is modal. This stops all animation and code in the Flash Player 7. Untested on Mac.

function pauseMovie()
{
        var p = new PrintJob();
        p.start();
}

function onKeyDown()
{
        switch(Key.getCode()){
                case 80: // p key
                pauseMovie();
                break;
                case 19: // pause/break key
                pauseMovie();
                break;
        }
}

Key.addListener(this);

See also: http://www.jessewarden.com/archives/000495.html