1    /LOG

    /LOG
    /NOLOG (default)

    Displays the names of the subkeys of the top level key as they
    are deleted.

2    /WAIT

    /WAIT=seconds (default = 90)
    /NOWAIT

    Specifies the maximum amount of time, in seconds, that you are
    willing to wait for command completion.  If the Registry server
    does not complete the request in the specified interval, REG$CP
    returns REG-F-NORESPONSE. The default interval is 90 seconds.
    /NOWAIT is equivalent to specifying /WAIT=0, but there may still
    be a short wait period.

3    /WRITEBEHIND

    /WRITEBEHIND
    /NOWRITEBEHIND (default)

    Specifies when the information can be written to disk.
    /WRITEBEHIND specifies that the information can be written to
    disk later. /NOWRITEBEHIND specifies write-through operation
    (that is, the information must be written to disk immediately).