The basic functions of help-authoring tools are: File Input/Create => Edit => Help Output
File Input Formats : HATs obtain their source text either by importing it from a file produced by another program, or by allowing the author to create the text within the tool using a text editor. File formats that can be imported include HTML , Microsoft Word , MIF ( FrameMaker Interchange Format) and compiled help formats such as Microsoft WinHelp and Microsoft Compressed HTML Help . The ability to import compiled help formats is useful when the source text for those files has been lost.
Help Output Formats : The output from a HAT can be either a specialised help file in a format such as WinHelp or Microsoft Compiled HTML (CHM), or a general-purpose document file such as Adobe PDF or HTML .