Attendee Online is web application which works in accordance with EventPro Planner. It allows online registration by functioning as a web server and it accepts and responds to http requests via a specified port.

Each page generated by Attendee Online is controlled by a corresponding template (HTML) file. This HTML template controls the placement and appearance of all objects (i.e. buttons, links, data entry fields, data display fields, etc.) available to the page; it works like a "mail merge". This feature enables several events to obtain a different look and feel. Implementation of this module requires previous experience with HTML programming and knowledge of web servers in general.

EventPro Planner communicates with Attendee Online by uploading and downloading information to and from a web server. You decide which information is entered online by the attendees and then download this registration information into EventPro Planner.