i keep reading through the links you gave, but still don't really understand.
i use this nagios checker > http://sourceforge.net/projects/nagios-wsc/
in the checkmultihost you gave, there is this
svn co https://checkmultihost.svn.sourceforge.net/svnroot/checkmultihost checkmultihost
but in the link i gave for nagios checker, there isn't any :x