Linux: How to make a daemon/service usable with xinetd?

Anybody knows what changes are necessary for a server to work with xinetd ?

The server being a .NET mailserver that runs on Linux.

See the bottom of this post for reference: Lumisoft Mailserver Forum Post

Note: xinetd, not mono-service. [x]inetd is an internet superserver.
A superserver starts a server service on demand.
(As opposed to the server service running continuously, which is what mono-service does)