As a public service, here are some tips if you're stuck without a remote clicker...
--<Enter> or the right arrow key will move your presentation forward one slide.
--<backspace> or the left arrow key will move your presentation backward one slide.
--If you know your slide numbers, you can get to them immediately by entering the slide number and <Enter>. Go immediately to slide 23, for instance, by pressing <2><3><Enter>.
--Press the <B> key to blank/black out the presentation and <B> again to restore it.
--Press the <W> key to white the presentation and <W> again to restore it.
I've been presenting Powerpoints for 15 years and I'm always amazed how many people don't know these shortcuts.