For all users, the system is rather simple. One needs to identify to the system using his, transparently encrypted, username and password. He than has access to personalized levels of authority on the system and quiz plug-in. The user profiles can be edited at all time according to the necessary conditions, today we have three profiles:

1 - super-administrator: all access to the site functionalities and contents, some of them necessitating him to 'break a seal' in order to get access to the data

2 - authors: have author rights on the plug-in but no other rights on the page itself, they can go through cases as the examinees, or in an edit mode where they can change their own cases only, they can upload and delete their image files as well as add, edit and destroy their own questions while access to other authors' cases for dynamic groupwork

3 - examinees: have only the rights to access and browse the cases during the amout of time their session was given, form a defined place on the net (serves as identity and login during the exam session)

The image case collections are based on the basic file manipulation of BolinOS. All files are uploaded to the server where they are cloned in various formats for diverse interface uses (vignettes, small size, medium size, full size). The questions are memorized in the plug-ins specific database, linked to the cases images, as well as are the answers of all the candidates (with information on session date and place, corrections, retries, chronology of cases browsed, machine and software used by the viewer).

Source images are uploaded to the server that defines rights according to the user and page where the quiz plug-in is situated. These are physically stored on the web page's corresponding file system secured-folder. Each image is related to one or more cases according to what has been decided by the question's author. The images that will be displayed on the client Web browser are distributed in minimal-loss JPEG format. If the uploaded image is in another format (e.g. DICOM, PNG, TIFF, BMP, ...), the BolinOS / ImageJ layer of the core system will convert these to the appropriate format in order for the quiz, or other plug-ins to be able to manipulate them correctly.

The use of a standard BolinOS file-management system also enables us to use the other plug-ins available to the whole system (e.g. Atlas, Image Collection, Navigation, ..) as well as the basic multimedia editor for web page construction. These possibilities have extensively been used by the development team for the building of the quiz.

The quiz system extensively uses BolinOS users and groups management capabilities and adds increased security and possibilities to manage specified examination session duration, result tracking (for online answering), and detailed interactive-browsing analysis.

Quiz creators can track who and when questions and cases have been added or modified, are notified automatically by email, can manage cases and related documents, check answers, download stand-alone result sheets, and manage authoring history of cases.

While developing the quiz system, many functionalities of the core system of BolinOS have found improved ways. The main enhancements offered to the open source community, where related to image manipulation functionalities, as well as in complex user rights, tracking and examination result management. The integration of the National Institutes of Health open source project ImageJ (Java application) has been enhanced in order to offer an alternate case browser with real-time brightness and contrast  modification to the quiz (has not yet been used for examinations). The need for the creation of a 'static' version in case of 'unpredicteable' network failure has rendered CD-ROM and USB key version creation much more efficient and interactive as it was before (with Javascript and Java code inclusion; previously used as urgent backup during examination).

The fact we decided also to develop the online-questions interface has also brought new ways for user tracking and result management.

The need to present candidates with a real example of the tool they would be confronted to has sparked the creation of an important section of the IntRad website. The later need for nation-wide individual use of the quiz authoring system has also offered us to enhance it. All examinators are now able to use the system from their own workplace, managing their time as desired while having access to other experts' current work. Basic teaching of the tool by our development team, the self-registration of authors in the system, a few glitches on user and development sides finally resulted in a small web-savy radiological community with concrete expertise of simple online examination tools. The site has also been used as a 'centralized vault' for reunions and discussions of cases and questions from diverse places with Internet connectivity.