First off the key server needs to know about all client and server keys in order to function. Given a potential client base of over 70,000 individuals, a poorly defined pool of services and the inherent volatility of these groups, this could be a significant challenge. Many Kerberos clients are available, though not all the WiscWorld clients are Kerberos compliant. Jack Keel DCE is a superset of Kerberos security features. Name service to support a directory of services available.
Source code is provided to vendors who embed it in their products, primarily in operation systems.
For example IBM and DEC have both DCE in their operating systems. The PC OS picture is less clear. Apple claims they will work on it eventually. A company call Gradient does have DCE products for Windows and Apple environments. DCE does have some performance issues above 40,000 principles, but does support distributing key serving.