DOS programs to access long file names, so Emacs built for MS-DOS will
only see their short 8+3 aliases.
-@cindex @env{HOME} directory under MS-DOS
+@cindex HOME directory under MS-DOS
MS-DOS has no notion of home directory, so Emacs on MS-DOS pretends
that the directory where it is installed is the value of the @env{HOME}
environment variable. That is, if your Emacs binary,