,load filename ...(load "filename") because you don't have to
    shift to type the parentheses or quote marks.  
    (However, it is still possible to specify a filename as a Scheme
    string literal, with quote marks--you'll need this for filenames
    containing whitespace.)
    Also, it works in
    any package, unlike (load "filename"), which will work only
    work in packages in which the variable load is defined appropriately.
,exit [exp]
    Exits back out to shell (or executive or whatever invoked Scheme 48
    in the first place).
    Exp should evaluate to an integer.  The
    integer is returned to the calling program.
    The default value of exp is zero, which, on Unix,
    is generally interpreted as success.
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