Re: Documentation for desktop launcher??
If you use the GUI to create a launcher, which is as simple as right clicking on the desktop and selecting "Create Launcher", then the launcher will execute what ever command you have in the command line. If you can type it in the command line, then you can create a launcher to do the same thing.
jpollard is right, though. If you need variables, decisions, or several commands, then you may have to write a script and launch that instead. However, scripts are not that complicated (I just started writing them a week ago and it already seems to me that you can do almost anything from a script).
I am not sure exactly what you are trying to do here, but if you can tell me how you would do it from the command line, I can probably tell you how to either do it from a launcher or from a script. Or, just give a little bit more information about what you are trying to accomplish.