/READ_ONLY

 /READ_ONLY
 /NOREAD_ONLY (default)

 Determines whether exiting writes the main (or first) buffer to a
 file.  If you specify multiple input files on the EDIT/TPU command
 line, this qualifier applies to each buffer.  Does not affect other
 buffers you create during the editing session.

 /READ_ONLY is the same as /NOWRITE.  For EVE, this makes the MAIN (or
 first) buffer write-locked and also makes it unmodifiable, unless you
 used /MODIFY.  Use /READ_ONLY to view a file without making any
 changes.  For example, the following command lets you view a file
 named MEMO.TXT, so you can use cursor-movement commands but cannot
 change the text:

    $ EDIT/TPU memo.txt /READ_ONLY

 /NOREAD_ONLY is the same as /WRITE---on exiting, EVE writes out the
 MAIN (or first) buffer to a file if the buffer has been modified, and
 if necessary, EVE prompts you for the output file name.

 In EVE, the status line shows whether the buffer is read-only or
 write.  Also, you can change the read/write and modification
 attributes of the buffer during your editing session by using the SET
 BUFFER command.