A config is the parameters or information needed to crack a webpage login. It will consist of whether the login delivers information from server to client with GET or POST data. It will have the fields necessary for a login to be attempted I.E. <USER>, <PASS> fields, a token (CSRF or other string) or variable if needed, submit login command, and any other information needed to submit a valid login request server side from the client. It will also have the "failure" key which is any key or phrase denoting a failed login, and the "success" key which is any key or phrase denoting a successful login. It will also have whether proxies need to be run and what kind or proxies and what combo list is needed (user/pass or email/pass or both).
So in short a config is ALL the information needed to crack or attempt to crack a webpage login.
