+=item B<FLUSH> [B<timeout=>I<Timeout>] [B<plugin=>I<Plugin> [...]] [B<identifier=>I<Ident> [...]]
+
+Flushes all cached data older than I<Timeout> seconds. If no timeout has been
+specified, it defaults to -1 which causes all data to be flushed.
+
+If the B<plugin> option has been specified, only the I<Plugin> plugin will be
+flushed. You can have multiple B<plugin> options to flush multiple plugins in
+one go. If the B<plugin> option is not given all plugins providing a flush
+callback will be flushed.
+
+If the B<identifier> option is given only the specified values will be flushed.
+This is meant to be used by graphing or displaying frontends which want to have
+the latest values for a specific graph. Again, you can specify the
+B<identifier> option multiple times to flush several values. If this option is
+not specified at all, all values will be flushed.
+
+Example:
+ -> | FLUSH plugin=rrdtool identifier=localhost/df/df-root identifier=localhost/df/df-var
+ <- | 0 Done: 2 successful, 0 errors
+