You can enter any URL of a tsv file to load, but you may run into cross-domain issues.
If you want to load a sample of cards, simply type ‘SAMPLE’ without the quotes. You can download the sample TSV file here.
You can download the Adobe AIR app here. The AIR app will not have the same cross-domain issues, but still needs to be connected to the internet to upload the cards to the server.
Check out Battle Checkers for the original game.