SPELLCHECKER <commandline> [@file] [@line]
        <commandline> = Program commandline.
            @file : Token which is replaced by the message filename.

        While in the internal editor, you can use the EDITspellcheck
        command to save your message to a file and shell to external
        spellchecking software. When the check is completed, the
        corrected file is read back and you can continue editing your
        message. The EDITspellcheck command uses the EDITsavefile and
        EDITloadfile commands.