This is a tool for parsing the roll results for raids, it will try to give you the results and indicate if someone is having fun with multiple rolls, or rolling from invalid bases.
So how do I use it, well when you are running the raid, and doing loot, you write the text (in the raid chat) "Roll Now!", or "has acquired" (loot assignment), the text must be literally written as it is here.
When the rolls are finished, you can right click on the chat tab, and select capture chat log, this will show a filename in your chat box, highlight this filename, and press control-c
Go to this page, and click browse, in the file field, press control-v and send the file to the server, the server will then analyse the log for you.