The gmStudio distribution includes a batch script that can be used to run gmStudio from the command line.
You may find a copy of this script is found in \[INSTALLDIR]\support\settings\RunGmStudio.cmd. Use the Settings Form to copy the file to your work space if you plan to modify it.
A productive use of this script is to re-translate your source and deploy your .NET project while you are working on the .NET project in Visual Studio. This is done by adding gmStudio to the External Tools dialog as shown below. Passing in the $(TargetName) will restrict processing to the current project.