-If this entry is not provided, then
-.B mhstore
-will use a simple
-built-in FTP client to perform the retrieval.
-.SS "The Content Cache"
-When
-.B mhstore
-encounters an external content containing a
-\*(lqContent-ID:\*(rq field, and if the content allows caching, then
-depending on the caching behavior of
-.BR mhstore ,
-the content might be read from or written to a cache.
-.PP
-The caching behavior of
-.B mhstore
-is controlled with the
-.B \-rcache
-and
-.B \-wcache
-switches, which define the policy for reading from,
-and writing to, the cache, respectively. One of four policies may be
-specified: \*(lqpublic\*(rq, indicating that
-.B mhstore
-should make use
-of a publically-accessible content cache; \*(lqprivate\*(rq, indicating
-that
-.B mhstore
-should make use of the user's private content cache;
-\*(lqnever\*(rq, indicating that
-.B mhstore
-should never make use of
-caching; and, \*(lqask\*(rq, indicating that