Hello @bakhshi
First, the online demo does not include the “CFF – SERVER SIDE EQUATIONS” add-on, because this website is accessible for every one, so, we don’t allow to define server side equations in the online demo.
Concerning to the DS controls, these are a set of controls whose values are read from external data-sources, like a database or CSV file, of course, the SQL queries associated to the fields, or the code that read the CSV files are executed in the server side. More information about the use of DS fields visiting the following post in the plugin’s blog:
https://cff.dwbooster.com/blog/2019/02/14/ds
I’m sorry, but we can’t continue replying about these questions in this forum. We are not allowed to support any customers in these forums.
For pro or commercial product support please contact us directly on our site. This includes any pre-sales topics as well.
Commercial products are not supported in these forums. We will happily answer this and any other questions you can have on our own site.
Thank you.