Employees who surf the Net at work could receive a bill each month for the cost of borrowed bandwidth and wasted time if Australia-based Exinda Networks' URL- and bandwidth-monitoring system takes off. Exinda Networks says it's developed a system that allows a company to <A HREF="http://news.zdnet.com/2100-9588_22-5558818.html?tag=zdnn.alert">monitor exactly which Web sites are visited</A> by each employee and how much bandwidth has been used--in terms of a cash loss to the employer.