在cmd下输入： hh /? 发现屏幕没有任何反应，这是怎么回事？然后又输入：hh ntcmds.chm--在命令行帮助文档中也没发现hh.exe的踪影。那么它什么工具呢，为什么有它的存在，却没有它的说明？
于是去microsoft查找了一番，原来它是HTML Help Workshop命令行工具。那么什么是HTML Help Workshop，嘿嘿，告诉你吧--系统内所有编译的帮助文档（chm）都是出自它手。
看看它的参数：
| hh.exe | -800 | 将Help viewer设为800*600 |
| -title | 将chm以窗口800*600显示 | |
| -register | 注册hh.exe，将其设为默认的chm文档的shell | |
| -decompile | 反编译chm文件，就是将chm拆散开来，对于破坏狂和翻译人员比较有用，懒人就免了 | |
| -mapid | 如果你记住chm中htm、html的id，那么用它定位htm、html文件 | |
| -safe | 迫使hh.exe以安全模式打开chm。安全模式？就是所有的快捷键都失效 |
附：help帮助文件的快捷键
Keyboard Shortcuts in Help
|
ALT+C |
To switch to the Contents tab |
|
ALT+F4 |
To close the Help window |
|
ALT+I |
To switch to the Favorites tab |
|
ALT+N |
To switch to the Index tab |
|
ALT+O |
To display the Options menu |
|
ALT+O, and then press B |
To display the previously viewed topic |
|
ALT+O, and then press F |
To display the next topic in a previously displayed sequence of topics |
|
ALT+O, and then press H |
To return to the specified home page |
|
ALT+O, and then press I |
To open the Internet Options dialog box for Microsoft Internet Explorer, where you can change accessibility settings |
|
ALT+O, and then press O |
To turn search highlighting on or off |
|
ALT+O, and then press P |
To print all topics in a book or a selected topic only |
|
ALT+O, and then press R |
To refresh the topic (useful if you have linked to a Web page) |
|
ALT+O, and then press S |
To stop the Help window from opening a Help topic (useful if you want to stop a Web page from downloading) |
|
ALT+O, and then press T |
To hide or show the pane with the Contents, Index, Search, and Favorites tabs |
|
ALT+S |
To switch to the Search tab |
|
CTRL+A |
To select the entire Help topic |
|
CTRL+C |
To copy the selected items to the Clipboard |
|
CTRL+P |
To print the current Help topic |
|
CTRL + TAB |
To move among the Contents, Index, Search, and Favorites tabs |
|
DOWN ARROW |
To select the next book or Help topic |
|
END |
To select the last group of topics |
|
ENTER |
To perform the action for the selected hyperlink, and to open a selected book or Help topic |
|
ENTER or RIGHT ARROW |
To expand a group of topics |
|
ENTER or LEFT ARROW |
To collapse a group of topics |
|
F6 |
To switch between the Table of Contents and the Help topic panes |
|
HOME |
To select the first group of topics |
|
HOME or END |
To go to the beginning or end of a Help topic |
|
PAGE UP or PAGE DOWN |
To scroll toward the beginning or end of a Help topic in large increments |
|
SHIFT+F10 |
To display a shortcut menu |
|
TAB or SHIFT+TAB |
To move forward or backward from one hyperlink to the next within a topic |
|
UP ARROW |
To select the previous book or Help topic |
|
UP ARROW or DOWN ARROW |
To scroll toward the beginning or end of a Help topic, and to select the previous or next group of topics |
虽然是快捷键，其实并不怎么实用，对于一个chm文档来说，最好的莫过于书签功能(bookmark)，特别是文档内容比较多的chm。
microsft不遗余力地推出chm，但是却受到来自adobe的pdf的威胁。相对于pdf来说，chm也不是无一用处，它小巧，启动快，门槛低（不用专业软件编辑--商业软件，反编译后用notepad.exe就行），不易编辑（除非反编译-_-!）。但是弊端也是显而易见，界面不友好，打印功能不强，安全性能不高（易被反编译）等。