how to trigger another script in unityscript

hi i was wondering is there a way to trigger a separate script in a script??? E.G. the script to make a gun fire and the script to make the bullet move, thats just an example

All scripts are components. You can access components by a reference. Once you can access it, you can call any public function it has. To access that reference, either use a public var and the inspector, or use Find functions. Among other ways.