editorial

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 # fusefile
 
-This project implements a "fuse" device to mount as a single file that
-is a concatenation of fragments of one or more files. The fused file
-allows overwriting to fragments but not changing their sizes and only
-for writable fragment files. A fused file may also be set up with an
-overlay file in which case that file will capture all changes instead
-of changing the underlying fragment files.
+This project implements a "fuse" device to mount a concatenation of
+fragments of one or more files as a single file.
+
+The __fused file__ allows writing to fragments (without changing their
+sizes); of course only for writable fragment files. The fused file may
+be set up with an __overlay file__ to capture changes instead of
+writing the underlying fragment files.
 
 ====
 This is a nominal usage example to set up a fused file C consisting of