Search notes:

System.Management.Automation.Internal.InternalCommand (abstract class)

The source code for System.Management.Automation.Internal.InternalCommand has the following note:
Ideally this would be an internal class, but C# does not support public classes deriving from internal classes.
As per another comment in the source code, it seems that InternalCommand is used as base class only for System.Management.Automation.PsCmdLet.

Index