The user documentation
In IAR Embedded Workbench for Arm version 9.60 and earlier, the user documentation came in two formats:
PDF files, accessible from the Help menu in the IDE
Microsoft HTML Help 1.0 (CHM) format, available both from the Help menu in the IDE and by pressing F1 on the keyboard, to get context-sensitive help.
In version 9.70 and later, the primary user documentation is in HTML5 format and located at docs.iar.com on the web. Context-sensitive help is still available by pressing F1. For offline use, there is also a snapshot of the user documentation in the state it was when the product was built, in the arm\doc\html directory. It is a compressed file with the name HTML_Help.zip. The version found at docs.iar.com is continuously updated with clarifications and corrected errors.
PDF files are still available from the Help menu in the IDE, but are considered a secondary format.