of the present invention in fig2 the exchanges that are collected under the designation set 3 represent the activities that might take place as spx 204 optionally dispatches one or more additional sms mms ims etc reply messages 236 to mary 202 such reply messages would as described above traverse the reverse path sp 204 u2192 vasp 210 u2192 wc 208 u2192 ms 202 as depicted by 238 u2192 242 such reply messages might contain for example further updates or status reports further requests for additional information that might then result in still further message exchanges etc the specific exchanges that were described above as residing under the designation set 3 are illustrative only and it will be readily apparent to one of ordinary skill in the relevant art that numerous other exchanges are easily possible and indeed are fully within the scope of the present invention the set 1 set 2 and set 3 exchanges that were described above are illustrative only and it will be readily apparent to one of ordinary skill in the relevant art that numerous other exchanges are easily possible and indeed are fully within the scope of the present invention for example 1 a sp may offer an optional registration process a registration process may be tailored e g the range of information gathered the scope of access subsequently granted etc to the class of user u2014 e g different types categories etc of users may complete different registration processes a registration process may be completed through any combination of one.