Module - Access
The Access-module is a solution for the first entry to the webcast. Access can be provided using a password or a form to fill out. It's also possible to login through Facebook or Twitter. Or dow you want you viewers to make a donation or payment before entering?
Login thru Social Media (Facebook / Twitter)
Login thru a question survey
Login with a password
Login with anticipated payment (Credit Card/PayPal)
With all the login-options, you can ask your viewer for additional information. And more, you can make an estimate of the quantity of viewer to expect.