::1 suffixes in GRAPHS setting in xymonserver.cfg

Hi list,

I am currently struggling to find more detailed documentation on the GRAPHS
setting in xymonserver.cfg. The manpage (or
http://www.xymon.com/xymon/help/manpages/man5/xymonserver.cfg.5.html) is
pretty sparse on that as I am curious what the effects of the "::1"
suffixes are that are appended to some of the items, e.g. "if_load::1". I
would appreciate any hints.

Thanks in advance
-cs