Nlrexecd is the service provider daemon for the Xnetlib services. The nlrexecd daemons running at UT/ORNL currently provide access to the Netlib software and document repository, the NA-NET Whitepages Database, the Performance Database, and the Conferences Database. Nlrexecd is written to be a general service provider, however, and can be configured to offer an arbitrary set of services, as long as they speak the Xnetlib protocol. A new service can be added easily by providing the code for the function to be called when the service is invoked.