A file of saved abbrev definitions is actually a file of Lisp code.
The abbrevs are saved in the form of a Lisp program to define the same
abbrev tables with the same contents.  Therefore, you can load the file
with load (see section How Programs Do Loading).  However, the
function quietly-read-abbrev-file is provided as a more
convenient interface.
  User-level facilities such as save-some-buffers can save
abbrevs in a file automatically, under the control of variables
described here.
write-abbrev-file.  If filename is
nil, the file specified in abbrev-file-name is used.
save-abbrevs is set to t so that changes will be saved.
This function does not display any messages.  It returns nil.
nil value for save-abbrev means that Emacs should
save abbrevs when files are saved.  abbrev-file-name specifies
the file to save the abbrevs in.
nil by defining or altering any 
abbrevs.  This serves as a flag for various Emacs commands to offer to
save your abbrevs.
nil.
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