How to Create a Context-Sensitive Help

Q. How to open the help system with the specified topic already opened (in order to create a context-sensitive help system)?

A. Just open your help system (normally, you need to open the file index.htm for that) specifying the relative path to your topic in the "page" parameter. If there are characters '/' or '\' in the path, change them into %2F. You can also open the help system with the Index or Search tab already selected. To do it, just open index.html with either "i" for the "Index" tab or "s" for the "Search" tab in the "tab" parameter. For instance, the link below will open the topic 'System Requirements' in the chm2web help, at the left frame it also opens Search tab:
Converted from CHM to HTML with chm2web Pro 2.74 (unicode)