adding members/users to Groups

adding members/users to Groups

Hi,

I want to create group to collaborate with someone.

First of all; Whats the difference between members/Users/guests.

Next; I try to add and/or locate using an email address but it says they don't exist. I would've thought that's why I'm 'inviting' them.

How do I go about adding someone who does not yet have a zoho account?

IS there anemail sent that will propmt them to sign up etc and join the group or do I have to manually invite them to create an account?

thx
Brad.