AJAX Support in Virtualmin

Hi, We have a customer who is inheriting a site that uses AJAX and wants to migrate it onto our system. We have no experience of AJAX and we are wondering whether we need to add functionality to Virtualmin to allow AJAX to run on a website or not? If we do need to add functionality, where can we find it please? Alternatively, perhaps Virtualmin just doesn't support AJAX. That would be sad, but it would be good to know either way. I can find odd AJAX references in the forums, but nothing that I understand clearly. Thanks in advance.