// during `init()`.
func RegisterDefaultKVS(kvsMap map[string]KVS) {
	maps.Copy(DefaultKVS, kvsMap)
}

// HelpSubSysMap - help for all individual KVS for each sub-systems
// also carries a special empty sub-system which dumps
// help for each sub-system key.
var HelpSubSysMap = map[string]HelpKVS{}

// RegisterHelpSubSys - this function saves
// input help KVS for each sub-system globally,

	if len(subSys) == 0 {
		return Help{KeysHelp: config.HelpSubSysMap[subSys]}, nil
	}
	subSystemValue := strings.SplitN(subSys, config.SubSystemSeparator, 2)
	if len(subSystemValue) == 0 {
		return Help{}, config.Errorf("invalid number of arguments %s", subSys)
	}

	subSys = subSystemValue[0]

	subSysHelp, ok := config.HelpSubSysMap[""].Lookup(subSys)
	if !ok {