RoboHelp offers three separate start files that you can use to call the WebHelp:

• The regular project start file, such as newproject.htm.
• The _csh start file, such as newproject_csh.htm.
• The _rhc start file, such as newproject_rhc.htm.

Every start file expects an URL with specific options. The regular start file is all that you need and supports context sensitive help by using topic id's, map numbers and URLs. The other start files are legacy start files that may still be useful.

Every start file offers multiple ways of calling the WebHelp contextually. There are a total of five methods you can use to show the help topic you want. Note that there is no one start file that supports all the available methods.

• By using WebHelp internal id's. (I don't know why you would want to do this, but it can be used.)
• By using the Map number you have set in the RoboHelp project.
• By using the topic id's you have set in the RoboHelp project.
• By specifying the relative path to the topic from the project root.
• By specifying a file inside the project directory that doesn't need to be in the project. (Files you add after generating the WebHelp.)

In the remainder of this article I will describe every start file, its options and the methods it supports. I will first describe the regular start file as that is probably all you need.