All this depends on what use you have in mind; if you just want to screen various words and phrases, what used to be called Death by a Thousand Bullets, as a prompt for yourself and to better engage the audience, then producing some slides on PowerPoint is quite easy, and you can save them onto a memory stick for playing on another PC. However, most of the work in organising and animating the slides has to be done in advance, of course, and ideally you need to have a PC link to a data protector and screen obviously at the venue. You can still import photos and graphs and the like, but as they say above, videos and sound recordings may be more difficult.