Check if user(name) exists in CB Registration

Hi, first of all my compliments for the great ChronoForms!

I bought this tool and it was very easy to make some nice forms in little time. But working with the plugins is a more difficult for me. After spending a lot hours of searching on this forum I've managed to get a form (with the Registration Plugin) working and have its contents added to the CB tables. But now I have two questions:

1) How can I validate in the Registration form if a user(name) already exists?
2) How can I make one single form with some fields from the table "jos_user" (e.g. "username", "password" and "email") ans also some fields from the table "jos_comprofiler" (e.g. "address", "city" and "birthday")?

Thanks!
Ray

Hi Ray,

#2- you can do this and use the CB plugin only!
#1- check this post and replace and "joomla" word in the code by "cb"
http://www.chronoengine.com/forums/index.php?option=com_chronoforums&cont=posts&f=2&t=14231#p32069

Cheers
Max