This is a beginner's guide —a hand-holding fun ride with step-by-step instructions and illustrative screenshots. If you want to write a professional script or screenplay using the open source tool Celtx, this book is for you. You need not have any previous knowledge of Celtx or any other writing software.
PACKT Publishing just sent this book on screenwriting to me for a comprehensive review to use in their media. They are a Pub House in the U.K. with fabulous releases and reviews. I'm honored to be going through the book currently while using it to finish up my own screenplay for Randall Wallace (Secretariat, Pearl Harbor, Braveheart, We Were Soldiers), titled The Secret City. I've already had Celtx downloaded on my laptop for some time, but it's nice to receive a book to review that punches through the obvious tools in it, revealing entirely new strategies that one would not have found on their own. If the timeline permits, I will rate this particular Guide in August, 2012.