In general, it is always better to run a PowerPoint presentation off of your own laptop computer. You are familiar with the size, shape, key location and eccentricities of your own keyboard, so this reduces the chances of blunders during your presentation.
But there is one danger to using your own computer during a speech or training session: your own email. If, for example, you were checking your own email before you began your presentation and you didn’t close the program, your email could pop up at an inopportune moment. Let’s say you have finished your presentation and you are closing your file in order to let someone else use your computer for another presentation. If your email program is open under your presentation, your email will now be visible to everyone in the room if the projector is still on. This opens you up to all sorts of embarrassments.
