12. The storage medium of claim 10 , further comprising instructions for implementing: summing the usage measurements; acquiring at least one multiplicative value associated with the usage measurements and with unit costs; and recording any such acquired multiplicative value as an on demand charge to a requesting customer.
12. The storage medium of claim 10 , further comprising instructions for implementing: summing the usage measurements; acquiring at least one multiplicative value associated with the usage measurements and with unit costs; and recording any such acquired multiplicative value as an on demand charge to a requesting customer. 13. The storage medium of claim 12 , further comprising instructions for implementing at least one of: posting the on demand charge on a web site if requested by the requesting customer; and sending the on demand charge via e-mail to the requesting customer's e-mail address.