/WRITE
       /NOWRITE

    Specifies whether or not the buffer you create is writeable and
    therefore modifiable. This qualifier and the /READ_ONLY qualifier
    override any setting established by the SET DIRECTORY command. The
    /NOREAD_ONLY qualifier is equivalent to the /WRITE qualifier.

    If you specify neither the /WRITE nor the /READ_ONLY qualifier,
    LSE uses the default established by the most recent SET DIRECTORY
    command for the directory that contains the file. If during your
    current editing session you have not issued a SET DIRECTORY
    command nor defined the logical LSE$READ_ONLY_DIRECTORY, then
    the buffer is writeable by default.