Various technologies have been used to produce the items available via the NFLC Learning Portal. Each item detail page lists the technologies that are either required or that reflect the target technology set used during development. This does not necessarily mean that your desktop configuration will not be able to run an item.
For example, some items in the NFLC Learning Portal when launched, will display an alert that warns that you need a specific browser that is no longer available (ie. Netscape). Most modern browsers will be able to launch items that display such an alert.