To use guiLiner you will have to: 1) ensure that the format of the command line is such that it can be hosted by guiLiner (see section 1.2), 2) Create an XML specification file for the program (see section 3.2) and finally 3) run guiLiner with the hosted program (see 2.1.2).
If you are a developer, there is one other consideration. You may want your finished command line program to have an option to output guiLiner XML so that this can be generated and used directly from your binary. This will make maintenance of your code and updating the help information much easier.