The .NET Framework includes a system of Code Access Security (CAS) that tries to prevent untrusted code from performing privileged operations. When the CLR loads an assembly at runtime, it uses CAS to determine whether the assembly has permission to perform the requested operations. By default, the framework gives assemblies installed on a network share limited permissions. These limited permissions would prevent the GUI for .NET from running.

OpenEdge's Shared Network Installation Utility provides an option to adjust these permissions to allow the GUI for .NET to run. You should consult with your IT administrator about any security issues before using this option. For more information, see the section on shared network installations in OpenEdge Getting Started: Installation and Configuration.