For Visual C# developers we offer our MDI-Projectworkspace for the further development of their own products. The Workspace needs Visual C# 2008 Express and contains all source files to the construction of a form administration for the Windows-CLR (Common-Language-Runtime). The resulting MDI program manages the forms of an application and a base program. The MDI-Projektworkspace consists of a base program created from a base project an application project with an example program the MDI project to the administration of the forms a project to the construction of a kryptographic activation key and one project to the imbedding of refined license protection. The source code contains multithreading and the award of license files. The resulting form administration program consist of a MDI frame with a menu in which a application and a base program can be invoked repeatedly. The application and the base program extend the menu of the MDI form and have a context menu and a three-sided dialogue form itself. The operator surface and the HTML help text is multilingually for German English Spanish Portuguese Italian and French to the selection from the help menu. Within the projects the function of all procedures is described in detail with her parameters. Furthermore the procedures are commented in the source text well. A diagram for the overview is ready in the PowerPoint format. A detailed manual which can be edited in the Word format also further stands for the familiarization in the projects and in the surroundings of the MDI-Projektworkspace to the disposal.