While using BEAV individual buffers may be saved to disk during the editing session. When quitting BEAV you must save all buffers or delete all buffers. There are two commands that do this.
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Ctl-C quit-no-save Sh-F10
If there are any unsaved buffers you will be prompted for conformation before proceeding. All buffers will be deleted then you will return to DOS.
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Ctl-X Ctl-E quit-save-all Sh-F9
All buffers are saved before exiting to DOS.