Methods and apparatus for managing a joint slide show by a source user terminal in communication with one or more remote user terminal(s) are disclosed herein. During the slide show, a plurality of picture files are shown on the source user terminal. One or more slide-show display-transitions are performed at the source user terminal by replacing, at a slide-show display-location of the source user terminal, a pre-transition picture file with a post-transition picture file. In some embodiments, (i) for each slide-show display-transition, a respective post-transition picture file is sent from the source terminal to each remote user terminal in advance of the slide-show display-transition and/or (ii) each of the slide-show display-transitions is contingent upon, and performed only after meeting a condition related to a number of remote user-terminals from which the source terminal has received a confirmation message confirming receipt of the respective post-transition picture file.