The development of hypervideo systems presents a number of challenging interface design issues. Context dictates the answer to some of the questions, some of the time, but there are no hard and fast interface design rules to follow for hypervideo interface design. The wireframe appears when the user rolls his or her mouse of the link opportunity, and a cue in the status bar notifies the user of the link destination. Spatio-temporal links are indicated to the user by a circle or shape around the target.
Different targets warrant different colored shapes.
Since the video is ostensibly moving, the shapes track with the action in the frame. See Link Opportunities in Hypervideo for a more thorough discussion of link opportunities. These methods, however, are not always effective. Current users of the HyperCafe system have indicated that interface cues in HyperCafe do not effectively indicate the presence of links in the system. Clearly some research needs to be done in HyperCafe , and in hypervideo in general to determine user interface guidelines for specific hypervideo tasks and procedures.