A system for establishing an encrypted multicast communication session over a
communications network can include a client means (eg, a radio, laptop, workstation, phone,
PDA) and a server means. The client means can transmit a request for a first user to join a
pre-defined collaborative group, including at least the first user and a second user. The
client means can transmit a request for a first user to create or select a collaborative group
based on specified criteria. The system can also include a server means that can retrieve …