how to get all information about any inbuilt command

lets say, I want to know details about ‘CaptureScreen’ command, all parameters info, function signature,description etc. how can I get for each command.

The commands and functions are documented in either the Eggplant Reference or the SenseTalk Reference. All of the documentation is accessible from the Help menu in the application. You can also download the individual help documents from the Downloads link at the top of this page.

It will be really good if ADHOC do block can display all information about the command like signature,param info. or other tools have a *.chm file which is very easy to search.
or in the manuals, it will be good to include the 1st line about any command as function signature then followed by examples.