Reading Usable Help
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Gordon R. Meyer
Authoring with myManuals
MOApp's myManuals is a lightweight authoring tool for creating HTML-based documentation. It allows you to rearrange chapters, automatically add steps, and annotate screenshots. You can export your work (apparently as one long, scrolling document) in PDF, HTML, XML and other formats. For sample output, see the product's own manual. While clearly not aimed at professionals, myManuals might be just the thing for quick task guides and small projects.
See also PandaWare Updates Simple Help Editor.