Hai Friends , I am new for OpenERP , having some Question while installing new module .

1. While install new module through OpenERP apps , the authentication is required . My Question is , For what type of modules authentication are required ?

2. Also , Sign up to install apps It's free up to 3 users means ?

Its a basic thing but difficult to understand , so please clarify my doubt .

Thanks & Regards OMPRAKASH.A