The documentation for the XNS Courier package is currently in very bad shape.
Ask JQJ@CORNELL to fix it.

In particular, we need man pages for xnscourier (compiler), xnsbfs, and
the authentication library (if it ever gets written).  Also, the courier
manual needs a better installation section and miscellaneous errors
corrected.  Finally, man pages for procedures from the remote programs in 
the courier library (e.g. Printing 3, Authentication 2, Clearinghouse 3, 
Filing 4, etc.) should be written.
