The tutorial and reference books cover Iris itself, including an introduction to writing virtual books. Both are good examples of what Iris can do with these types of books. Although a sample text adventure was not provided, it's obvious that Iris was designed with gaming in mind. Internally, Iris uses a format similar to the well-known DOS batch file. Just type a colon followed by the name you want to give the following text.
Topics can be any length.
Rename the file with a .PGE extension, and you're in business. Of course, you might want to go on and take advantage of the many special features Iris offers, but that's optional. Note that Iris does not include an editor. Burgeoning authors would also want to print a copy of the IRIS-XTR book for reference. Your submissions are invited, and royalties will be paid.