lobby scan using name lookup tool [closed]

I state that I am a neophyte. Is it possible to create a tool that scans a game lobby, like the poker one, where there are 1vs1 matches? Having a table with nicknames of players, the tool should detect by scanning the tables when these (players) sign up.
If yes, how? surely the tool works on the client and not on the server. I thought about a possible use of mysql, ocr.

thanks

in the lobby they use this kind of tool, and even having found the nick, they self-register against it in a few thousandths of a second.