Chinese Toolbox is a Chinese reading program. It is a computer program for Windows to help you not only read Chinese, but more importantly to learn it as well. For more information about its reading features, see Chinese Reader. For a description of how the program helps you to actually read Chinese, see Read Chinese.
Chinese Toolbox makes it a lot easier to read Chinese documents. Just clicking on a character, or selecting it with the left/right arrow keys, will cause definitions to appear in the dictionary windows. As you learn the meanings of characters and words, you can mark them for unassisted reading so that the program only shows you definitions that you don’t know. By marking characters and Chinese words for unassisting reading in this way, you end up removing a lot of “clutter” from your study of Chinese. What remains are the things that you need to focus on.