Before revision:  Moreover, it is observed that an interchange exists among the first two moments in service and switch-over times such that the HT limits remain unchanged. \geq2
After revision:  Moreover, it is observed that an interchange exists among the first two moments in service and switch-over times such that the HT limits remain unchanged. \geq2) queue polling systems, but one can also easily relax the distributional assumptions. The results and insights of this note prove their worth in the performance analysis of Wireless Personal Area Networks (WPAN) and mobile networks, where different users compete for access to the shared scarce resources.