A courseware development and e-learning authoring system for Windows from SumTotal Systems, Inc., Mountain View, CA (www.sumtotalsystems.com) that uses a "page and book" metaphor analogous to Apple's HyperCard "card and stack." Its OpenScript language is also similar to HyperTalk. ToolBook was originally a product from e-learning pioneer Click2Learn, Inc., which merged in 2004 with Docent, Inc. to become SumTotal Systems.