1    /ALL

    Deletes all key definitions in the specified state; the default
    is the current state. If you use the /ALL qualifier, do not
    specify a key name. Use the /STATE qualifier to specify one or
    more states.

2    /LOG

       /LOG (default)
       /NOLOG

    Controls whether messages are displayed indicating that the
    specified key definitions have been deleted.

3    /STATE

       /STATE=(state-name[,...])
       /NOSTATE (default)

    Specifies the name of the state for which the specified key
    definition is to be deleted. The default state is the current
    state. If you specify only one state name, you can omit the
    parentheses. State names can be any alphanumeric string.