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+VMCACHED -- VMcache daemon.
+
+The VMcache daemon is a Unix server which manages a file cache in virtual
+memory.  This is used to optimize virtual memory usage, allowing files to
+be cached in memory so that they can be shared or accessed without going
+to disk.  It is also possible to conditionally access files via "direct
+i/o", bypassing system virtual memory and transferring the data directly
+from disk to or from process memory.
+
+NOTE: as of Dec 2001, the Vmcache library and vmcached have been updated
+to provide the capabilites described above.  The daemon runs, and was used
+to develop the VM client interface, which is currently functional, tested,
+and installed in os$zfiobf.c.  The new version of the VMcache library
+however, has not yet been fully tested and should not be used.
+
+Since this code is still under development it is not part of the normal
+IRAF build (hence no mkpkg or mkpkg.sh).