Single-letter "macros" have been added to the harvard shell.
These are referenced by typing the letter preceded by
a dollar sign ("$").  To define the string which will appear
in place of the letter, use the command "save".

The "save" command has three formats:

1)	@ save any-string-you-please c
    (save "any-string-you-please" under the letter "c")

2)	@ save
    (display the strings associated with each defined letter)

3)	@ save  -  ac-fh ...
    (delete the definitions of a, c to f, h, ...)
