/SHARE[=option]
       /NOSHARE (Alpha/Integrity servers only)

    Opens the specified file as a shareable file to allow other users
    read or write access. If you specify the /SHARE=READ qualifier,
    other users are allowed read (R) access to the file, but not
    write (W) access. If you specify the /SHARE=WRITE or the /SHARE
    qualifier with no option, users are allowed read and write access
    to the specified file.

    To open a file with no shared access, specify /NOSHARE or use
    OPEN/READ/WRITE.