1. When i register, do i get a mail with a e-ticket?
The user receives a confirmation email that you customize. It will dynamically include data from the registration based on what you setup. You can even make this even custom PER EVENT. It can include all the user details, payment info, confirmation number, barcode, etc.
2. When i pitch up to the event, what do i have to show that i am registered?
The user can print off the email they receive, which again includes whatever you have put on it to include. Every record has a unique confirmation number. You can also attach files that are sent to the user with the confirmation email.
1. How do i check that someone has a ticket. The actual place where the event is might be somewhere with no power or internet access - is there a list that i could print to tick off as people come in? I want to make sure that people did buy a ticket and don't just say they have or have copied from someone else?
The admin can see all records in the Joomla admin side. Now, if you don't have access to a computer, you can (prior to the event) export a CSV file from DT Register... select the event(s) to include, then select all of the needed fields, then export the file. That also would include the unique confirmation number. Having that at the event, you could check names / confirmation numbers of the people against your data sheet.
If you have other questions, let us know.