Abstract: Methods and associated apparatus automatically activate ‘reactive’ responses within live or stored video, audio or textual content delivery. The invention allows participants to engage in a manner that closely approximates a live interaction with a “subject matter expert” of a product or service or with the presenter of a meeting or course. The various embodiments, including Demo, Training and Meeting applications, all involve admin-user(s) with a high degree of control over the above-mentioned media assets. The embodiments also involve end-users, also referred to as “viewers,” who may view and ask questions relating to the product, service or presentation showcased in the video, audio, or other media assets.