Apple Newton Backup Utility (for Windows) - Manual (Page 37)

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To run the Newton Backup Utility with Windows 3.1, you must turn on your
computer’s file-sharing and virtual memory functions, if they are not already on.
Turning on file sharing
To turn on file sharing, edit your AUTOEXEC.BAT file. Using an editor, such as
Edit, open the AUTOEXEC.BAT file and add the following line:
Share
When the computer runs the AUTOEXEC.BAT file, it will turn on file sharing.
Appendix Setting Up Windows 3.1
for the Newton Backup Utility