I've never dealt with Ajax and I'm having a rather frustrating time with an upload progress bar I found on the net that's supposed to be really good. That's beside the point. I just wanted to know if there are any Ajax related packages out there that need to be installed on a server in order for ajax code to work.
There are no specific server-side requirements for ajax in itself, but people do often write/use ( custom ) programs that run on their server, and communicate back and forth with certain ajax-enabled pages.
It may be that this ajax application requires a similar custom server side program/script, but that's not necessarily the case.