Yes Bob, you are right. A pose file for box_1 will not work on box_2 (unless "actor box_2" is included in the pz2), and vice versa. If we were applying the pose to the prop (the prop is selected), rather than the figure, we could use 'actor $CURRENT' in place of 'actor box_1', the prop would parent to the figure that is currently selected in the Figure dropdown menu. On the other hand, when we apply the pose to a figure (some part of the figure is selected), we need to specify the prop name, because Poser has no way of knowing which prop we are referring to if we use 'actor $CURRENT'.