如何在分布式.Net应用程序中一次只能让一个用户访问资源（屏幕）？

I have a client server based windows forms application that needs an administrator only screen. The administrator functionality needs to be implemented in such a way that at any given time only one administrator can access that screen. The windows forms client application talks to the server using .NET Remoting. And the server side is distributed on multiple machines.I have a client server based windows forms appl