The UPS in our machine room provides a pair of wires which are an open 
circuit when on line power and a closed circuit when on battery power.  I'd 
like to detect this on a NetBSD/i386 box so sysadmins can be notified via 
pager when we go onto UPS.  I'd prefer if it could be detected on two 
different boxes for failover, but one box would work.

Does anyone have any suggestions for how this could be done?

	-Kevin