Abstract: A Location or Activity or Presence Monitor enables a Providing Member to supply visibility in real-time to Requesting Members of their current location or activity, a literal or abstract description of their current location, the communications services available to them at their current location, and their willingness and ability to communicate. The presented Location or Activity information may be personalised depending upon a Member Group assigned by the Providing Member to the Requesting Member. Requesting Members who submit an enquiry for current Location or Activity information relating to a particular Providing Member will see the personalised Location or Activity information for the Providing Member's current location.