Looks up a list of Instance identifiers in the metrics name space.
#include <dci.h>
DCIHandle handle;
DCIMetricId *metricIdList;
uint32 numIds;
DCIReturn **bufferAddress;
uint32 bufferSize;
DCIStatus ulrc; /* Return code. */
ulrc = dciListInstanceId(handle, metricIdList,
numIds, bufferAddress, bufferSize);