Library /sys$common/syshlp/ncphelp.hlb CLEAR, LOGGING, ALL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Indicates that all logging parameters for the specified component are
 to be removed from the database.  The logging component(s) must be in
 the  OFF state to use the ALL parameter.  The component is no longer
 recognized  by the network.