def addperfcounter(self, object, counter, machine=None):
		BaseQuery.addcounter(self, object=object, counter=counter, machine=machine)
A "Performance Counter" is a stable, known, common counter,
dataset/ETHPy150Open eBay/restcommander/play-1.2.4/python/Lib/site-packages/win32/lib/win32pdhquery.py/Query.addperfcounter