https://learn.microsoft.com/ja-jp/dotnet/api/system.runtime.remoting.wellknownclienttypeentry?view=netframework-4.8.1
WellKnownClientTypeEntry Class (System.Runtime.Remoting) | Microsoft Learn
Holds values for an object type registered on the client as a server-activated type (single call or singleton).
class systemruntimeremotingmicrosoftlearn