This book describes how to use the Rexx Twain functions. The section entitled Function Reference lists all of the Rexx Twain functions that you can call. Each function is on its own page. The name of the function is listed first. Listed below is its syntax (ie, what arguments you pass to it and what it returns), as well as examples of its use. Arguments that you must supply are in blue, and arguments that you may omit are in red.

You'll note that all functions begin with the letters Twain. To avoid conflicts with Rexx Twain function names, do not name any of the functions in your REXX script starting with those 5 letters (neither upper nor lower case). Also, do not use the variables TwainErr and TwainHeading for purposes other than setting error handling features.

The sections of this book leading up to the list of functions describe how to do various tasks with the Rexx Twain functions. So, they are overviews (ie, tutorials) of how to use Rexx Twain in various ways, whereas the list of functions are more of a reference complete with incidental notes/details.