I saw this example and immediately thought of all the Dreamland script kiddies, it's pong in one script. However it will need slightly changed to work with ENIGMA just like Studio, follow the instructions in the script. Additionally because of current bugs in local access from scripts you will need to place the remaining code into the actual draw event, nothing should be left in the script.
All in all, it's a pretty cool example but by default the paddles are extremely slow!
Here is the script I pasted for convenience so you don't have to download.
http://pastie.org/9636536This is the forum post where you can obtain the original.
http://gmc.yoyogames.com/index.php?showtopic=605813