Sometimes the intention is to detect the param on the way back, regardless of whom it came back from. For example, the param may point to specific time on the

Sometimes the intention is to detect the param on the way back, regardless of whom it came back from. For example, the param may point to specific time on the video. Or the param may point that the video is part of some playlist, so that when somebody clicks he is brought not just to the same video but also to same playlist. As we don't know anything about this particular param we don't know if it is the case.