Which key helps users navigate forward through a list in the system?

The Page Down key is specifically designed to allow users to scroll down a list or page in a document or interface smoothly. When navigating through lengthy lists or data sets in a system, hitting the Page Down key advances the view, allowing users to quickly access the information that follows. This functionality is particularly useful in scenarios where many entries exist, and the user needs to transition efficiently without needing to use a mouse or other pointing device.

In contrast, while the Enter key is typically used to select items or confirm actions, the Arrow Right key is mainly for moving the cursor or selection point to the right within the same line, and the Spacebar can also activate selections but does not function specifically as a navigation tool in the same way as Page Down. Thus, choosing Page Down makes the most sense for forward navigation through a list.